Newbie trying to install PowerColor Radeon 9250 PCI card

Just a newbie trying to install a Powercolor Radeon 9250 PCi 128mb card in my older Aopen 733mhz PC to set up a cheap gamer for my kids. I uninstalled the on-board graphics driver (running Win 2000) as suggested in the instructions, installed the board plugged in the monitor but I get no signal to the monitor when I tuirn on?
I moved the monitor back to the on-board monitor plug and can get a picture (in600x400 or whatever) and the computer is recognizign the card, IO install the drivers and software and reboot, but still no picture through the card.

Does anyone have any suggestions? This is a great site for newbies like me to learn, you guys/ girls are really helpful and hopefully someone can suggest something to get me going. Thanks
 
You either have to disable onboard VGA in the BIOS or set a jumper on the motherboard. What kind of computer?
 
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