[john70t]

You want the information off the hard drive.
The rest of the computer might be considered worthless.....depending.....

To go the long inexpensive route:
It will take internet research and maybe weeks waiting for components to arrive.
Motherboard/Power/Fans/Memory/tracking problems/running diagnostics/etc
These all add up.

To fix it now:
Take out the HD, and plug into another computer as a slave drive.
(Changing jumper pins might be necessary.)
This will tell you if THE HARD DRIVE is fried.
New computers and backup drives are cheap these days.

If the HD is fried, there's no need to waste any more time.
The whole computer can be recycled at this point.