vothsr :
I installed this old Geforce card in one of the PCI slots. Start PC and Windows XP starts to load, then monitor goes black. I have to plug monitor back into the onboard graphics. Whats the problem?
This is PCI card, not PCIE as it was correctly stated above. PCIE has nothing to do here!
Unfortunately Dell motherboards had been setup differently from the others - if PCIE is exists on motherboard, video card will work only from PCIE, not PCI! This is Dell.... Sorry. Nothing you can do here, at least nothing to my knowledge.
I seen similar problem before with another Dell model, thai where I learned about this thing.