...I think. My old Dell monitor goes into power save mode immediately on boot (as in, I saw a boot screen once and it immediately jumped into power save. Even if I restart, I never see the boot screen again. However, I know my tower is working because I can log into Vista and access my HDD via my network and laptop.
Anyone have any idea as to what's happening? It can't be a motherboard or RAM issue because the computer works fine, and I've already tried replugging the cables and resetting the monitor's power. Granted, my LCD is 13 years old, but it was still working perfectly up until today (no dead pixels, even!). Is my monitor on the verge of death no matter what?
You could try reseating the video cable after system boots up, but I don't expect that to do much other than flash the current screen output before becoming unresponsive. Alternately your GPU could be at fault, but dead monitor is way more likely.
Edit: As grouch says, it could be blown caps. Remove the housing and inspect caps (cylinder-shaped doohickeys soldered to circuit board, likely on power supply board). Look for bulging or leaking (could be black stuff, could be whitish crystalline stuff). Caps are pretty cheap and if you'd like to try your hand at soldering (or have a friend) this could be a relatively cheap fix.
Similar issue on a 52" samsung lcd tv. Bought the replacement capacitors and fixed the board. It is still entertaining my family. Spent $150 on the service manual and $15 on six capacitors. So $165 to fix.
Thanks for the tips, I guess? I'm at a total loss to explain how it fixed itself, but as long as it did I guess I can't really complain.