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screen won't come on, changed bios setting and now no display

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Last Modified: 2012-05-12
I was working on an HP that the screen would get to the loading windows and then go black.. you could hear the windows chimes that it had booted, but no display... so if found some info online about changing the bios settings to fix it... well..... no... now i have no display at all!!!!  I have taken the battery out of the motherboard, and there is a little toggle switch where cmos is and i've toggled it with the power on and off... still nothing...  Sorry to say, but by memory, i can't tell you exactly which options i messed with.. it was 2 different ones.... both said PCI something or other...
PLEASE HELP!!!
Windows XP Pro
HP Compaq dc5750 minitower
S/N : MXM80208L0
P/N : KA391UT#ABA

On the motherboard it says windsor PCB rev 1.0
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