I have had this problem since building my box earlier this year, but it was never really serious. I'll start by telling you my basic hardware setup... Windows XP Pro SP2 ASUS A8R32-MVP Mobo AMD 64 X2 4400+ 2GB OCZ RAM ATI x1900xt 512MB Video Samsung 940bf LCD 1280x1024 19" What happens is this. If everything is off (monitor and PC) and I power up, what normally happens is my video card fan spins up real loud, the screen POSTS, the video card fan spins down, and the rest of the PC is completely quiet. This is a normal boot... Sometimes (maybe 1 in 4 boots) I'll hear the video card fan spin up, I don't hear the single beep POST, and the fan does not spin down, it seems to be stuck in a loop with a black monitor screen. To remedy this, I just power down and start it back up. This is when I power the system up from the start....I also get a problem sometimes when I reboot from the OS. I will restart the computer, it goes back to where it should normally POST, but instead I get a black screen and no beep sound for the POST message. Monitor is black screen again. It seems like a POST issue because I don't hear the single POST beep like I normally would. In Windows XP itself, I have no performance issues and benchmarks run fine. Memory tests fine in memtest86 in DOS. Everything seems fine and everything works fine except for the occassional POST not going through, which requires me to power off and back up. I thought it could be a video to monitor connection problem at first, now I'm thinking motherboard BIOS issue. It's intermittent though, and 3 out of 4 times it's fine, the other time it's not working.