I have an older hp computer (1.7ghz, 640 ram, 60Gb hdd) and it randomly shuts down after a random period of time. This problem should not be related to an OS for I have installed several on the hdd and the problem still persists. By "randomly shutting down", I mean the computer does not actually shut down completely, rather it enters a "standby-like" mode. Many of the parts are still on ( i.e usb devices, keyboard, mouse) but all the fans and output to the monitor ceases. And I know for a fact the processor and hard drive are still functioning well. I was guessing it to be a short in some circuit, but I wanted to get some opinions. Thanks in advance.