Dell gx-280 video signal and no boot.

I recently purchased a gx-280, p4, 3.0 GZ with cdrom and floppy, hard drive was wiped clean, but unit had no video adapter. Came with 512MB of memory.

I hooked up the unit after installing a newly purchased pci video card (ATI 32MB graphics card) and I got no video signal at all when properly connected to my lcd monitor.

Computer would not boot. Tried another video card (Radeon 64MB), still no video signal. I know the monitor works, as it works on my other system. I'm a retired computer guy, knowledgeable about hardware, etc., so I went to Dee's support site, downloaded on my other computer the bios flash, copied it to my gx280 and tried to flash but my gx280 doesn't boot. Fan and power supply are ok, floppy detect is ok at startup, but can't get video. Cleared the PW on the motherboard thinking that might be the prob, but now I get two quick beeps at startup as if I have a memory prob.

Really confused on this one. Is there something I havn't tried or have done wrong. According to the surplus dealer I purchased it from, all it needed was video and it was good to go, ready to accept a new op system...Can someone offer some advice on this, or should I just send it back (which I hesitate to do now that I've purchased additional memory which has not been delivered yet). Stuck at the moment.:sigh: