im not new to building computers at all
ive been building them for years
but this has me baffled

my new puter wont post into bios

asus a7v8x mobo
XP 2200
512 ram
etc....

the odd thing is, that i dont get any beeb warnings on post, so i have no idea if something is wrong
(yes all the connectors are in, and yes ive switched them around multiple times to see if that was the prob.
all the fans start up, HD's spin up, flopy is correct, cd rom lights turn on etc...)

i am baffled right now what it could be

and i tried booting up directly from a boot disc, but that does nothing either

any help would be appreciated
thanks
bob