radeon 9000 ati graphics card and xp

I need advice from all you gurus.
I have installed, uninstalled, re-seated the afore
mentioned but my monitor does not boot up properly ( did
same to that too, The problem lies with the boot up. When
the dos screen disappears and the windows starts to boot
up my monitor goes into standby so I have to un plug and
re-plug in the power to get it to fire up again. such a
pain!!!!!!! please help me. Thank you soooo much!!!

radeon 9000 ati graphics card and xp