My monitor started fading--not changing colors. It got so dark I could hardly read it. My husband replaced the video card. It's a PCI Radeon 9250 with 128MB. The monitor got better but got dark again. We hooked up our 1999 monitor and tried it. Both the old card and the new card was tried on both monitors and didn't get normal brightness. Currently, however, the original integrated motherboard card is working fine on this 1999 monitor. Can't figure out if there's a monitor or video card problem. In BIOS it looked as thought it recognized the PCI card. I didn't see anything that would let me turn off the older video card. I'm afraid to change monitors or do anything fearing I might get a black screen again. Thanks for your help.