I just put together a new tower, using the following new components:
Biostar A785G3 MB (cheap but got good reviews and has what I need)
AMD Athlon II X4 635 CPU
Corsair 2X2GB DDR3/1333 memory
WD Caviar SATA 500GB HDD
Lite-on 24X SATA DVD
EVGA GeForce 9800GT PCI 2.0 X16 Graphics Card
Coolmaster 700W PS
The problem is, when I fire it up it recognizes the CPU, the memory, and then both SATA drives, but then the boot sequence just stops. I jumped the CMOS to no effect. This behavior is repeatable, and pressing any of the usual keys (Esc, Del, F8, etc) does nothing. I have reseated all the cables.
The MB manufacturer has not responded to my trouble E-mail, so I am wondering if any of you experts have any idea what i might try next. If nobody had any ideas, i am shipping the MB back to TigerDirect.