Desktop

I would try going into BIOS and loading "Fail Safe" or "Default" settings for the mother board. Either the new video card is causing a dead short (bad card) or the is an IRQ problem. I would doubt the IRQ because you should get an error message on that.

This footnot at the bottom of the Sapphire web site concerns me:
"General Card Specifications are subject to change dependent upon region purchased in and subject to component availability. Sapphire has enjoyed a commitment to excellence and to its customers so please do not hesitate to inquire about specific products at your regional Sapphire office"

I have had problems with the voltage not matching between what the motherboard required and what the video card required. I would check specifications on both to assure they are the same.
Just a thought

Check BIOS settings for something like Boot PCI Video First or Boot AGP Video First. If possible, change BIOS setting to boot from PCI first.

Dalton

Boot the computer into Safe Mode, uninstall all software pertaining to graphisc card

Open Device Manager,check for any instances of the Display Graphics card,if so Remove

Rebbot computer and press the designated key to Bios setup,locate the on board graphics and make sure that it's disabled

Open case and reseat the Card in AGP slot,then proceed to install card,the card may have co0nflict that is causing it to hang make sure you have the updated software drivers

You may try installing the card with a larger powersupply hooked up externally. Some of those machines don't have enough power supply to run the new cards. Not sure that you can change the ps to a larger one, but it may answer the question of why it isn't going in.

Good luck,

Vickie