Mach Speed PM800BMS
I bought the same mobo today at Micro Center and have the same exact problem. It displays the first screen down to the "press DEL to enter setup" and then completely freezes up. I've got nothing attached to the board except a stick of memory, the monitor, and the keyboard. I tried resetting the bios like their web page suggests for a fix.
I saw a message on another forum describing the same problem. Must be a bad lot of Mach Speed boards. This is the 3rd system I've built this week with this mobo. The first 2 worked fine. I did notice this 3rd board is different than the first 2 with the power connector in a different location near the edge of the board.
I'll be taking it back and exchanging it tomorrow. I'll post an update for people with the same problem in the future.
Funny thing... I noticed about 6 "open-box discount" (returns) on the shelf when I bought mine (new). Why would someone return a mobo unless it didn't work... Maybe they didn't like the color. :haha: