I got this great machine (Dell XPS 600) in 2005 and have been very happy with it except VT option in BIOS. I have had it turned on all the time since it was running a VM for serving some web content. However, a few weeks ago, I heard a small explosion from the inside of the computer and a little bit of smell. And then it would not boot indicating some POST error from BIOS.
I opened up the case and it was very obviously that its motherboard was burned. It has been constantly used since it ran as a server and stuff; however, it was never heavily used – I do not play games and did not overclock it (they kind of go together I guess). I guess it may be affected by Capacitor Plague