Relevant components are:
DFI nF4 ultra-infinity
Athlon 3200 (939)
AOpen GeForce 6600
1GB PC3200 (Kingston value series)
Antec NeoHE 430W
Everything worked perfectly when I put it together, and I've been using it happily all week, through Thursday night. When I turned it on Friday evening, though, I had nothing -- no video, no beeps; just a quicky flashing power light at the front of the case. All the fans are still spinning, but that's about all that's going on.
I've reseated the video card a few times, but that doesn't seem to help; I've also tried two different monitors -- nada. I tried resetting the CMOS, also to no avail.
Interestingly, if I remove the video card completely and power up, the power light _doesn't_ flash, and I get a long-short-short-short beep off the mobo, telling me ... that I don't have video. Perhaps it's a bit sad that I see that as a good sign.
So. obviously _something_ has fried, because it all used to work and now (after a total lifetime of 6 days) it doesn't ... but is it the motherboard or the video card? If any of the above points strongly in one direction, it would be great to know -- I don't have replacements on hand to swap in for either, so I'm looking at buying new ones, getting RMAs, and all that hassle.
I'm _hoping_ that it's the graphics card that's gone to the great mid-tower in the sky, as dis/re-connecting a motherboard is a true pain in this case (an Antec P-180 -- an attractive but difficult beast). I'm a little suspicious of this graphics card, anyhow; it's fanless, and while the heatsink seems nicely contacted to the GPU, most of the other thermal pads are hovering over (rather than touchng) the chips on the edge of the board.