PC power on,then shut off after a second or two.

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haqeem18

Honorable
Dec 9, 2012
10
0
10,510
hello there.

So i can't boot my PC.it doesn't POST,no beep at all.I have try Clean the inside of the PC(Very dusty).Tried remove the RAM out and the PC does POST with a long beep which indicate no memory install.Reinstall the RAM,the problem comes back.Could the RAM be the blame?Currently i don't have any spare RAMs unless i go out and buy it.

Thanks. :)
 
Solution
Chicano
Anything is possible... someone could have taped the standoffs just to add extra insulation or to fix a previous problem. You could tape the standoffs again to see if it makes a difference. You could also remove the spare PSU and replace the previous one.. it may be the spare PSU wasn't in good condition an is causing the problem.
Also, depending on how you removed the dust, if it was done inappropriately it's possible you caused Electrostatic Discharge Damage. It should be done using air only, to prevent touching the components with anything that can cause Electrostatic Discharge. It's adviseable to use a compressed air can or a compressor at low pressure, and only after removing the BIOS battery, and pressing the power button for at...
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
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35,490
That's a classical symptom of overheating CPU... (yes that quickly)
1. check if the heatsink isn't loose, or it's clogged with dust lint,
2. if the fan is running, or running to slow.
3. If the problem persists, remove the heatsink and apply new thermal grease.
 
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haqeem18

Honorable
Dec 9, 2012
10
0
10,510
Things that i have try:
-Change the PSU
-Change the RAM
-Reset the BIOS (Shorting the pins)
-Replace the Thermal Compound

The PC still won't boot.Any other solution?Thanks
 
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
29
35,490
See if resetting the BIOS by removing the battery for a few minutes helps
Has the time (1 to 2 seconds) from power on to power off changed any?
Have you checked the CPU power connector is all the way in?
Do the CPU fan, and case fan (if any) turn on?
Do the front panel LEDs turn on?.. if they do, do they flicker?
Does the screen show any characters or does it seem to change to a different tone of black? (providing there's enough time)
 
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haqeem18

Honorable
Dec 9, 2012
10
0
10,510
Resetting the BIOS didn't help.I think it's better if I tell the story tho maybe can help.Thing is that the computer was originally custom build for the cctv in our house.One day the computer had this problem (power on then shut off immediately),we change the cctv to a new decoder ones.So the computer was keep for a long time until i decided to use it as a home server.The first time i open the case,it was soo dusty so i cleaned it up,removing all of the components out from the case.I do notice that when i remove the motherboard,there are tapes covering the standoffs.I then put in a spare PSU that i got because the one that was in the computer was too dusty.I install everything back (except a expansion card for the cctv) the motherboard back to the case but this time i remove the tapes that covering the standoffs.I thought that this time the computer would be able to boot because cleaning the dust out but it doesn't.

So does the computer having the short?Because it's weird that i found a tape covering the standoff between the board preventing contact.
 
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
29
35,490
Anything is possible... someone could have taped the standoffs just to add extra insulation or to fix a previous problem. You could tape the standoffs again to see if it makes a difference. You could also remove the spare PSU and replace the previous one.. it may be the spare PSU wasn't in good condition an is causing the problem.
Also, depending on how you removed the dust, if it was done inappropriately it's possible you caused Electrostatic Discharge Damage. It should be done using air only, to prevent touching the components with anything that can cause Electrostatic Discharge. It's adviseable to use a compressed air can or a compressor at low pressure, and only after removing the BIOS battery, and pressing the power button for at least a minute to drain residual power from capacitors.
To see if the standoffs were taped for a reason, try breadboarding the computer to see if excluding the case helps it boot: First of all, draw a diagram of the front panel connections to the motherboard header so you'll know which two motherboard header pins connect to the power switch, and also to re-connect the front panel connectors when you move the motherboard back to the case. Next extract all the components from the case and assemble them on a cardboard or woodboard. To power the breadboarded computer, connect the PSU to a power outlet, and switch the computer on by making contact with a small screwdriver or appropriate metal object between the two pins that connect to the Power Switch... a IDE device jumper can be used if you have one, and you're quick enough to attach and remove it a second later.

If it doesn't boot, the only way to know which component is causing the problem, is to test them on a compatible computer if one is available. The first to check would be both PSUs, next would be to try a compatible CPU on the motherboard.
 
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