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Power button got stuck at startup now computer doesnt boot

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  • Motherboards
  • Computer
  • Power
Last response: in Motherboards
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April 14, 2011 4:38:14 PM

I turned on the power button it got stuck during start up than turned the computer straight off and now the computer will not turn on at all. I tried reseating the memory and ram removing the cmos battery, unplugging the power cord and pushing the power button, i dont have a spare video card lying around and it doesnt have on board video. What do you do in a situation like this? getting no beeps and no video fans come on and cd drives but other than that its a boat anchor

More about : power button stuck startup computer doesnt boot

a b V Motherboard
April 14, 2011 8:03:32 PM

Unplug the PWR_SW connector from where it connects to the MB, cross those pins with a jumper, or wire, or screwdriver or whatever briefly, and see if it boots. If it does, you need to rig up a new power switch. Radio Shack sell a normally open push button.
If it doesn't you need to test the PSU as described here with a paper clip.
http://www.tomshardware.com/forum/265607-28-dead-paper-...
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April 14, 2011 8:49:59 PM

it turned on for a couple seconds than turned off the seconds that it was on powered up the monitor is that normal for it to shut right back off?
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a b V Motherboard
April 14, 2011 10:22:02 PM

No, that is not normal.
From this distance I can only guess you have a PSU. You could test it, or buy one you can return to the store to test whether the new one fires up your system. Depends on the age of your computer and whether it is worth saving, whether you were planning on buying/building a new one....
etc.
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April 15, 2011 9:24:24 AM

norrisb said:
I turned on the power button it got stuck during start up than turned the computer straight off and now the computer will not turn on at all. I tried reseating the memory and ram removing the cmos battery, unplugging the power cord and pushing the power button, i dont have a spare video card lying around and it doesnt have on board video. What do you do in a situation like this? getting no beeps and no video fans come on and cd drives but other than that its a boat anchor


Well that was a lot of stuff that had nothing to do with the power button being stuck :)  you need a new power button.. simple as that. Same thing happened to me it would start up and turn off in a few seconds because the button was stuck in. Either that or you can go into your case find out why it got stuck in. Mine was because it got stuck between the bezel. If you got the it turns off in a couple seconds after disconnecting the power switch wire on the motherboard and tried to short the pins personally i find that pretty unlikely since it just sounds like you pushed the power button and it was simply just stuck in and turned its self off as it should if the power button remains pressed in or hell could be the power supply.. i dont find that vary likely however. Unless its shorting and turning its self off..
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a c 156 V Motherboard
April 15, 2011 10:08:04 AM

norrisb said:
it turned on for a couple seconds than turned off the seconds that it was on powered up the monitor is that normal for it to shut right back off?

If it did that after you pulled the power switch header from the motherboard, and you temporarily shorted the power pins on the motherboard, you have other problems.

Work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%. If you have a white wire (many modern PSU's do not), it should be -5 volts.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.



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a b V Motherboard
April 15, 2011 4:07:30 PM

Smack the front of your case around with your hand/book/screwdriver/sledgehammer/whatever in order to get the switch unstuck.....
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September 28, 2011 9:15:45 AM

change mobo ur mobo is dead
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