I just put together a new gaming rig Monday night (specs below) and when I went to power it up, the PSU lights flashed, the fans spun a little, and then the thing shut off. The power indicator (green light) on the motherboard stays on after this, but I have to completely shut off the PSU to try again (always with the same results). I'd hate to think it was a bad Mobo or PSU, but the connections all look good to me (I've tried starting it with all the PCI/AGP/drives disconnected and it didn't make a difference). Can anyone suggest a different possibility/solution?

Specs
-------------------
P4 3.0E w/HT
ASUS P4C800-E Mobo
1GB Kingston PC3200 DDR
Aspire 520W PSU
Seagate 80GB SATA HD
Lite-on DVD+/-RW
Lian-Li PC-6077 Case
Albatron GeForce 6800GT
SB Audigy ZS 7.1

I'm starting to think that the system might be grounding out b/c the Mobo *might be* touching the case (I had trouble lining up the holes with the mounting brackets). Does this sound like a possibility? If so, could that mistake cause permanent damage to the components?

If you suspect shorting to the case best option is to remove the motherboard from the case and set it up on a non conductive surface such as a piece of cardboard, and see if it will boot like that.