how do fix a computer ?

Hewlett-packard / Hp compaq dc7100 sff(pk86...
October 7, 2009 at 00:36:55
Specs: Microsoft Windows XP Professional, 2.793 GHz / 503 MB
my pc fried. Here is what happened.

1.- Smelled burning electrics
2.- Lost power to the display monitor
3.- Something is shorting inside , when I plug it into the mains, the fan and lights are immediately on , either
the on/off switch is stuck or something is shorting inside.
What steps do I take to find out which individual part
is at fault ?

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October 12, 2009 at 16:30:10
thank u for your reply , I did some tests ,the following devices still work.
1- Hard drive
2- Display card
3- Cd drives
At this stage I know that the power supply has definitely been fried , I think I will not be able to find out if the motherboard still
works until I swap it over for a working one, so question - Do all PC power supplies give out the same voltage ? meaning I could use any?

Number 2 -if I find the motherboard is dead ,can I salvage the CPU ? they are a b---tard to get out , stuck under their little fan- are there any links that shows me how to remove them ?

Its a gygabyte motherboard ,but notice that this company have old small ones and the newer ones are a bit larger.
The one Im trying to remove is of the large type with 2 levers that loosen the fan, problem is once I push the 2 levers ,the fan only loosen ,but still will not come out when I try to pull it out, any ideas ?

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