I was playing Fallout 3 on my PC for about half an hour or so, when suddenly my screen flashed some pink and black static, and then my screen when completely black and read "No Input Detected". I tried restarting it to no avail. I opened my computer and checked out my video card and it looked fine. I took a can of air to everything and cleaned off what little dust was there, and hooked everything back up. After this, nothing powers on except the fans and lights. The mouse gets nothing, and still no video. I also hear no startup sounds which leads me to believe the mobo isn't getting power either since I'm running onboard sound. At first I had thought only my video card was gone from first hint of the pink and black screen, but now where I'm getting nothing, I think my PSU may have gone instead. Any tips or input?

Specs:
420w generic PSU
EVGA 8800GT
2x2GB GSkill RAM
320GB SATA HDD
Linksys Wireless N PCI Card