Computer Does Not Turn On With Power Button
Yesterday, the computer was working properly, and today, when you press the power button, it does not show any signs of life. What could be the problem? Is it possible to eliminate it on your own or not without the help of a wizard? Let’s get it right.
As practice shows, in most cases the power button of the Power unit stops starting the computer for the following reasons:
- Lack of voltage in the power supply network 220 V;
- Malfunctions of the line filter or uninterruptible power supply through which the PC receives power;
- Damage to the network cable or lack of contact at the points of connection;
- Malfunctions of the power supply unit (PSU);
- Lack of contact in the block through which the PSU is connected to the motherboard;
- Failure (lack of charge) of the BIOS memory battery;
- Sticking or malfunctioning of the Start button on the system unit;
- The system unit button does not work due to static blocking.
If the computer does not respond to pressing the Power button, the first thing to start with is to check the reliability of connecting the system unit to the network.
- Make sure that the power supply button (on the back of the system unit) is in the “ON” position.
- For a while, try connecting the computer to a power outlet directly, without a surge protector.
- Check if the outlet works by connecting any other working electrical appliance to it.
- Next, check the power cord for damage (especially if there are toothy animals at home). Make sure that the plug fits snugly in the socket and that there is no sign of heat at the point of contact.
- It will not be superfluous to check / replace the CMOS memory battery in which the PC configuration parameters are stored. If the computer is more than 5 years old, then replacing the battery is recommended even for preventive purposes.
If all of the above measures do not work, you will have to open the system unit to conduct a more detailed examination and diagnosis.
- Remove the housing cover, check if the LED on the motherboard is on.
- The indicator lights up. It means that power is supplied to the system unit.
- If there is an LED, but it does not light, check the contacts in the connectors, make sure there are no wire breaks.
The next step will be the diagnosis of start button.
How to check that the Power button on the system unit is operational
The task of the Start button of the system unit is to start the power toggle switch. After that, the PSU performs a self-test, and if all the network parameters are normal, the power supply sends the appropriate signal to the processor. The computer starts loading. All pre-launch events take a split second.
If the Power button poorly closes the contacts, the computer will not start.
To check if the start button works, you need to:
- Check the wires going from the button to the motherboard. The connection occurs through the chip, which is worn on the contacts of the motherboard.
- Make sure that the chip is tight and well fixed on the contacts.
To do this, carefully remove and reinstall the connector;
- Disconnect the computer from the network, disconnect the wires of the Power button;
- Turn on the power of the system unit again and use a screwdriver to briefly close the PowerSwitch (PowerSW) contacts. If the computer starts, the cause of the problem is an inoperative button.
Unfortunately, in most cases, the Start button cannot be purchased separately; you will have to change the entire case. However, there is an alternative solution to the problem.
To do this, just swap the two-pin connectors “power sw” and “reset sw”.
How to turn on the computer without a power button?
To turn on the computer without the Power button, do the following:
- Remove the cover of the system unit;
- Find among the wires coming from the front of the system unit to the motherboard a pair with the inscription on the Power Switch (PW Switch) connector;
- Disconnect the specified connector;
- Using a screwdriver, connect the 2 exposed contacts with a screwdriver or the tip of a ballpoint pen. Contact closure should be quick, literally with one touch.
Hello everyone. Who at least once did not encounter a problem when the computer does not turn on. At the same time, you can see a lot of symptoms from a dark screen to freezing BIOS or system boot. Let’s see all the most common and possible reasons why the computer does not turn on:
- The problem with the motherboard.
- Oxidation of contacts in RAM.
- Failure of the processor or chipset.
- Damage to the power supply. Especially often occurs when the PSU is operating at the limit of its capabilities. For example, after installing a more powerful card.
- Mechanical breakdown of the power button.
Today we will consider a series of steps that will help to find out or solve the problem. When the computer does not turn on and does not want to work. If you have any questions or additions, then write in the comments.
- Step 1: Check Power
- Step 2: RAM
- Step 3: Card
- STEP 4: Test the power button
- STEP 5: Power Supply
- STEP 6: Hard Disk
- STEP 7: Checking BOOT in BIOS
- STEP 8: Motherboard and processor
- Nothing helped
Step 1: Check Power
If the computer does not turn on or does not start, then for a start let’s check the most commonplace things. In 50% of cases, users accidentally pull out the power cable from the outlet or turn off the power filter with their foot. This is especially often the case at work when the cleaning lady for some reason decides to unplug the cord from the outlet. She’s probably afraid that she will be killed by electric shock.
Check that the lamp on the filter is on and it is turned on in the “ON” position (sometimes a dot is drawn). If it does not light, then there may be a problem in the filter or in the outlet itself.
Next, we check that the cable is firmly inserted into the power supply on the system unit. Also do not forget to turn it on so that the toggle switch is in the “On” position (stick, not toe). After that, try turning it on again.
Step 2: RAM
I encountered this problem both at work and at home. At the same time, when you turn on the computer starts to buzz, it seems to turn on, but nothing happens on the screen. There are two options. First, contacts are oxidized. The second one is one of the dies burned and you just need to pull it out.
- Disconnect the system unit from the power. You can simply turn off the power supply, but I would completely de-energize it by pulling out the cord.
- Next, you need to remove the side right cover.
- Now you need to pull out all the RAM dies. To do this, on the sides you need to click on the white ears at the same time.
- Next, we need an eraser. It is necessary to gently rub fanatics on the main contacts of the “operative”, which are located below, without fanaticism. This will remove the oxidized layer. If there is no elastic, you can try using a metal clip. But you need to do this very carefully, and gently rub the metal pin over the contacts.
- At the very end, blow them slightly and insert them back. I repeat that this needs to be done for each die.
- As soon as all the plates are inserted back, try turning on the computer. Do not forget, by the way, to reconnect it to the network.
If everything remains the same when you turn it on, then there is a chance that one of the dies is out of order. To find out: “which one?”. You need to insert it one by one into the connector, and remove the rest and try to turn on the computer. We do this until you find out which particular die burned out.
Step 3: Card
Another option is the problem with the image. If the system loading does not start, but the system unit buzzes and seems to be trying to load something, then you must first check which output is enabled on your monitor. Sometimes it happens that the monitor itself switches to a signal from a port that is currently not in use. Locate the “SOURCE” button on the monitor. It may also have a small square icon with an arrow inside. Next, click on it and switch the inputs.
If the problem persists, and on the monitor you see a message that “There is no signal”, then you need to check the cable. Insert the cable on the monitor as tightly as possible. Also, do not forget to screw in the special screws that help hold the wire.
Next, we check the cable on the system unit itself and look at the monitor. If there is no signal, then there are two options:
- Built-in or additional card burned out. Then we connect the cable in the integrated card, which is on the motherboard or vice versa. After that we reboot the computer.
- This port burned out or failed. Try connecting the monitor to a different port on the motherboard. You can also try other types of outputs: VGA, HDMI, DVI. You can also try switching the cable to another input on the monitor.
If your system unit is still open, check that the card is firmly in the slot. You can even lightly press on it. Sometimes it happens, when moving or carrying it flies out of there. Plus, for reliability, I would screw it to the system unit with bolts. If additional power is needed for it, then also check the cables that come from the power supply.
If you see even inconspicuous artifacts on the screen: stripes, small squares, the color change of some elements, extra numbers, letters, then this can indicate the dump of a textolite substrate from the GPU crystal. The second symptom is that after the Windows boot screen the monitor completely goes out. True, you can go under safe mode.
Open the menu of the monitor itself. If the menu is displayed correctly and without “artifacts”, then the problem is precisely in the crystal. In fact, there is nothing wrong with this, and this incident is completely resolved at home. Therefore, I already wrote detailed instructions on how to solve this problem. We look here.
STEP 4: Test the power button
There is a problem when the computer does not turn on precisely from the power button, but at the same time it is fully operational. The button may simply break, or special wiring may fail. This happens extremely rarely, but it happens. First, check that the wiring itself and the plug from the button are connected to the motherboard.
On the “motherboard”, find here such plastic plugs, as in the picture below. They are usually located in the lower right corner of the board. Next, you need to find the wire with the inscription “Power SW”. If it does not exist at all, then the button is not connected, and you need to insert these two wires to the “PW” connector (it can also be called as PWR SW or PWR_BTN). The connection is as follows: black to plus (), and white to minus (-). See the layout below in the nameplate.
If this does not help, then you can try to turn on the computer not from the button, but simply by connecting these two contacts. To do this, you can use a conventional screwdriver. Do not forget to turn on the computer in the network.
STEP 5: Power Supply
If the computer shuts down abruptly and ceases to turn on at all, this may indicate that you have a faulty power supply. Of course, you cannot check it yourself, but you can do this.
Usually they connect to the power supply: motherboard, hard drive, drive (if any), card, etc. Our task is to check that all cables are connected, and not one of them leaves. Check all connected wires from the power supply. You can lightly press on the cable itself so that it fits into the groove more tightly.
Another solution: try using loose cables. That is, take a free wire and reconnect the hard drive, card, motherboard and other connected devices. If you have a new computer, or you recently changed the power supply, then sometimes spare wiring is put in the box, you can use them.
STEP 6: Hard Disk
It happens when the system unit does not turn on and does not work, but it happens when the system does not boot when it is turned on, and you see this inscription: “DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER”.
First, turn off the computer and check that two main wires, power and a cable that goes to the motherboard, are connected to the hard drive. You can also try switching the cable from the hard drive to another slot on the motherboard. There are usually several of them.
STEP 7: Checking BOOT in BIOS
I myself came across this problem at work. The system refuses to boot, and you can see a black screen after the BIOS. This happens if you forgot to remove the system boot from the USB flash drive or CD / DVD disc in the settings.
- When you boot the computer, hold down one of the buttons that load the BIOS. Usually these are buttons: F2, Del, Esc or F10 (we look at the last column).
- When you get inside you need to find the “Boot” section.
- Next, you need to put in the first position “1st Boot Device”. Your hard drive. It will usually have “HDD” or “SSD” in its name.
- Now you need to save the settings and exit (Save and Exit). For this, look at the key in the settings.
- If this does not help, then try to boot the system directly from disk. When rebooting, you need to call “BOOT MENU”. Look at the third column in the table above. Most often they use the keys: F11, F12, F After that, select our disk. If there are several, then try to choose each one in turn.
STEP 8: Motherboard and processor
If the PC does not turn on at all, the fans do not spin, and yesterday everything was fine, and it worked, and today it does not show signs of life. Then we may have a more serious breakdown. Look carefully at the motherboard and board. If there are any obvious defects: darkening, burning marks, yellowness, leaked substances or swollen capacitors. If there are any such breakdowns, then this problem cannot be solved on your own, and most likely, it will be necessary to change the broken part to a new one.
If the PC is visually operational, all the wires are in integral form, and the and motherboard look like new, but when you turn on nothing happens, does not buzz, does not burn. Then the breakdown can sit much deeper. Here you need to carry it to a service center for inspection. If the problem is in the card or power supply, then they can tell you about it only there, since you yourself do not have the right equipment for this.