videocard bios? i don't think there is such a thing..
now, if you just can't see anything, check all your plugs (monitor, tower) andmake sure everything's plugged in all the way.
did you put this together yourself?
I know nothing about that motherboard.

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ASUS A7N8X-E Deluxe
AMD BARTON 2500+
GEIL 1GB DUAL-DDR400 PC3200
ATI RADEON X1600 PRO 256MB
WD 74GB RAPTOR 10,000RPM SATA150 HDD
MAXTOR 60GB ATA133 HDD
WINDOWS XP PRO