Xfx GeForce 9600 gso help!

I have an XFX GeForce 9600 GSO fatal1ty edition card

i was upgrading from a EVGA GeForce 7300 LE

when i put in my new card(the 9600) and hook it all up (power cables ect.) i get one long beep and my computer still starts up and all the fans are going even the one on the card. i even hear the windows start-up noises, but i get no display. but when i plug my old card it fires up and i get display no problem. whats wrong with my computer?

i made sure the card was firmly pressed in and all the ram was securely in place.

here is my specs if it helps

Name AMD Athlon 64 3200+
Codename Venice
Specification AMD Athlon(tm) 64 Processor 3200+
Package Socket 939

Chipset
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Northbridge NVIDIA nForce4 rev. A3
Southbridge NVIDIA nForce4 MCP rev. A3
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR
Memory Size 2048 MBytes
Channels Single

Windows Version Microsoft Windows Vista (6.0) Ultimate Edition Service Pack 1 (Build 6001)
DirectX Version 10.0

BIOS
Phoenix Tech.
V. 6.0 pg
Date 01/05/2006

EDIT: i have a 400w power supply

would updating my bios help? or perhaps resetting my bios?

Sure why not and you might be able to use slightly newer cpus from that generation assuming its a 939.