My son has the Dimension 5100 and got the new video card from Dell so he could set up 4 monitors. After installing the new video card, the system will not boot. He puts the old video card back in and it boots fine. Running XP. Any ideas, I thought it may be the power supply is to small (305 watts).
Did you check to make sure the video card is installed in the right spot? Has the onboard video card been disabled in Windows - and when you say it will not boot, do you mean physically no POST. Do you get any error codes? If you can get into the CMOS (Bios) Setup screen - change the primary display adapter from the onboard to AGP, PCI, or PCI-E depending on which card that is. Use this information at your own risk - hope it helps.
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