New build, no start

[yokems]

New build consists of
Mobo-Biostar P4M800-M7A socket 775 Micro ATX
Ram-2 Ultra 513 DDR PC3200 dual channel
CPU-Celeron D 3.2 socket 775
PSU-Ultra 500W ATX
HD-Seagate serialATA 160G
After assembly, computer would not start, not even a post beep.
CPU fan is running, fan and hearsink are new. Disconected floppy drive and optical drive, still no start.
Replaced mobo wih another (new, same model). No change. Swapped PSU. with a spare unit, still no start.
Switched ram module slots, NG. Removed ram mod. one at a time, no change. After all this, still the only thing that starts are the cooling fans, and still not even a post beep.
Never had this kind of problem before. I would appreciate any help.
Thanks, Yokems

[Cricket]

Follow the troubleshooting steps found here and let us know what happens. You must remove the motherboard from the case when doing this...you're trying to determine if the motherboard is shorting/grounding out to the case or not.

Cricket

[yokems]

Thanks for the info. I will give this a try. If this dosn't work, I'll look at the processor next. I will post the results.
thanks, yokums

[chuck4456]

Did the floppy drive and optical drive show any signs of life when they were connected?