What hardware can be at fault in these trouble symptoms?
* Sometimes, when my computer is turned on nothing appears on the screen even though the video card and the monitor cables are set properly.
*Even though nothing appears on the screen, CD-ROM drives still scan for CDs and the hard disk activity light doesn't stop.
*Sometimes, when I play heavy graphic games, my computer restarts.
I think my video card or my hard disk is at fault. What do you think?