Why does the computer shut down after i turn it on?

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tavman

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Mar 30, 2008
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I'm not sure if this is the right forum to put this in but anyway here goes:

Why does my computer shut down a few seconds after i turn it on? It is inconsistent but it happens frequently meaning i can use the computer but sometimes it will start but most of the time it switches off again. I have tried changing power cables and powerboards - even powerpoints and i had a little play with the RAM but everything is still the same

Any ideas?
 
Joined
Oct 3, 2007
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752
Possibly overheating, do you have any temp monitors in the BIOS or other temp monitoring software?
 
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Jul 19, 2005
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11,670
#1-Test the power supply.

#2-If the power supply tests good, you MAY POSSIBLY have a problem with bad capacitors. Take the side off the machine and use a bright light to look carefully at the capacitors. The capacitors are small can type objects that should be perfectly flat on the top. If any have "bulging" tops, are leaking a brownish looking fluid, or the capacitors are leaning (not perpendicular to the motherboard) they may be bad.

Attached is a link showing what you should be looking for.

http://www.badcaps.net/ident/

Bad capacitors may not be near as bad as some of the ones pictured and still be bad. Also, you may notice a slight "metallic" or "amonia like" smell in the case.
 

tavman

Thread Starter
Joined
Mar 30, 2008
Messages
5
Ok i have just checked it. With more analysis the computer doesn't seem to have a problem when it has warmed up a bit. I accidentally found this out when i didn't put the RAM back in properly. The computer continued to run but continuously beeped noting that the RAM wasn't being recognised.

I also notice that some of the capacitors weren't entirely straight so this may be the cause (thanks for that). Any other ideas?
 
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There are facilities that offer replacement of motherboard capacitors.
 

crjdriver

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Jan 2, 2001
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43,489
You can replace the caps however it may or may not be cost effective. Sometimes board makers do not get all caps fitting flush with the board ie they lean a little. This in and of itself is not a problem. If the leaning is caused by a leaking cap, that is another matter. Often leaking caps can be hard to see. I had one board that I just knew had some failed caps however they were not visible until the board was pulled and then you could see them.

Cold boot problems that go away when the system is warm are very often power supply problems. Since the ps is easier to swap than the board, I would swap in a known good ps and see what happens.
 
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