I'm having the same problems. P4C800-E Deluxe, 3.0GHz P4, 1GB Corsair TwinX DDR400, ATI AIW Radeon 9800 Pro. Board would not post, BIOS error code (1 long, 2 short beeps) indicates problem with Graphics card memory. I RMA'd mobo and AIW. 2nd mobo and 2nd AIW do exactly the same thing. Even tried a PCI Radeon graphics card today and same thing happens so I'm guessing it's not the AIW nor a low voltage issue on the AGP (some have said to bump the AGP voltage up 0.2v). A tech at my local computer hardware shop said he thought he heard a problem about board compatibility with a 3.0GHz processor and that I should try to flash the BIOS to the latest version. But since it doesn't like the PCI graphics card either, that's not possible. Sounds like others are having a similar problem. Anyone talked to ASUS? I've posted questions on their website but no aswers after almost a month. I'm beginning to get very frustrated with this mobo. Only other solution is to try a slower processor and maybe different memory or maybe an ABIT (hear that ASUS?????) mobo.