Ok, my sister got a new 60gb hard drive and another dimm of pc-100 sdram for her birthday, my dad went ahead and installed them for her. The computer booted just fine except that it couldn't see her HD. My dad then proceeded to reboot only to find that it wont boot back up. Power turns on fine, sounds like everything is going good, cd even opens, except that the monitor is not receiving anything. Found an older video card, popped that in, still nothing, me and my dad have tried every combination of plugging in/unplugging the HD, diffrent video cards(he mobo doesnt have a monitor plug) and we cannot get the monitor to get a signal. She has a p3 500mhz. Can anyone help explain this problem? me and my dad are fresh out of ideas.