My computer does not start sometimes!

Hi,

I am facing a strange power issue with my computer.
The problem is, whenever I press the
button, the computer is not switching on. It remains like a dead
system. But after few hours, it boots by itself and works normally
until I shut down. When I shut down my computer, it shuts down
completely but the cpu fan keeps rotating and the power light remains
on, the system does not go to complete off state. I forcefully switch
off CPU and the story continues like when I press it does not boot,
after some hrs........!! Technical support at the manufacturer told me
to change powersupply, but it didnt help. then they asked me to change
the button which controls on/offf. It also didnt help... Now I am
really confused with what is going on... since my system works without
hanging even for several days when it got booted, I could not doubt on
motherboard also. Could anybody give any suggestions? I would
appreciate of any help as it is troubling me a lot.

Thanks
LVL 1
ageraldnaveenAsked:
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nobusbiljart fanCommented:
possible causes :
-Power supply --> swapped
-mobo - or bad caps as said
-other devices : disconnect all not needed, and test with only mobo, cpu + 1 ram stick, video card, and disk, keyb + mouse
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CallandorCommented:
This may be bad capacitors on the motherboard, which is more likely if the motherboard is old.  See www.badcaps.net
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ageraldnaveenAuthor Commented:
I will try out suggested things, and will update the progress later. Please post if someone knows any new ideas too.
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ageraldnaveenAuthor Commented:
I have not solved the issue. Neither I am sure, if these answers are right. I 've split the points among the people who tried to help me solve it.
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nobusbiljart fanCommented:
>>   and will update the progress later   << xxxx  ! !  :=))
i'm sure your Q is answered, but but we cannot repair a bed device, or mobo; that needs to be replaced.
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CallandorCommented:
ageraldnaveen,

Hopefully, you realize that it's not our fault that we couldn't help you more, since you said that you would update the progress.  A C grade is usually reserved for little or no help provided by responders, due to their effort: http://www.experts-exchange.com/help.jsp#hi73
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