Here's what you should do/have:
1 - plug in all power connectors on your mobo. (24pin atx, 4pin psu, 4pin molex, 4pin floppy)
2 - us a 24pin native psu. DFI clearly states they require a 24pin psu (no adapters).
2.5 - update the mobo bios
3 - WinXP w/ SP2
4 - nforce 6.53 & marvel lan 7.21
5 - nvidia 71.84 & DirectX 9.0C
Do you have all the following ?
Regards,
Jose