I'm playing around with a socket A Athlon XP system. I just downgraded my cpu from 2500+ to the 1800+ so that I could stick the 2500+ into another box instead. I pretty much kept everything else the same. I changed a few other things, but they shouldn't affect anything. Here are the full details: 1. I fully took out the motherboard from the case to facilitate the cpu transfer (A7N8X by ASUS) 2. I took out the video card, dusted it off with compressed air can, and put it back in (it's a Radeon 8500, 64mb) 3. removed my sound card (permanently) 4. took out my 3 memory sticks and put in 2 others of lower capacity 5. disconnected floppy. Now, after I put the 'puter all back together, I plug in the DVI cable from my monitor into the video card exactly as before, and it just tells me: "check signal cable". And stays that way when I try booting. When I plug in the analog cable, it's normal. WTH? I never had this issue before; the DVI had always worked without a hitch as far as I remember. I switched the cpu before (upgraded from the 1800+ to the 2500+... now I reverted back to original setup) and there were no problems. What's the matter now? Anyone have any ideas??