I have a ASUS P4B266-LA motherboard and cannot get any video out. Tried new video card, and monitor is good. Even tried S-video output from new card. Screen goes straight black and monitor light turns orange. Even tried new CPU. Any other possiblities before I try finding a new motherboard? Appears to be only thing left. Yes, I tried the memory, too. Any help would be greatly appreciated!!

Two possibilities:
1.) Heatsink - this piece of metal has loosened, and now for whatever reason the board is being shorted... try a new heatsink (and whichever processor you choose), or attempt to remount the original one.
2.) Power Supply - power supply has crapped out... or worse, damaged a component (i.e. motherboard)... try a new one of these, if possible. Otherwise, just check connections, and search for bloated capacitors (apparent bulge in the middle).

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