....after first time starting PC, video card will not display

Hi,
Last night i put together a PC and when i started for first time CMOS
setup come up. I started to go through and check setings. Then in
about 5 minits it sudenly the last 5 lines was of letters "
eeeeeeeeeee" and it frezed. So i powerd down and on, but from now on
when i start nothing is displayed. I can hear that fan for power
supply and CPU works, the Led light in front come up and down but
nothing is displayed. I have syntax k7s746fx motherboard with socket A
and AMD XP + 2600 processor. I also have installed 512 MB PC3200 NON
ECC DDR DIMM RAM. The motherboard does not have build in Video
interface(no port), but has AGP 3.0(8xAGP). So we installed Verto
graphic card GeForce4 MX 440 8x. I wonder if anyone has ideas of what
is the problem? I would appreciate any help. Thank's
Margots

P.S. by the way this is my first time puting PC together, so perhaps
it migth be something simple.