i was browsing away happily when my screen flashed. it went blank and when it came back on, it was @ 1024x768 or something like that. it's a 30" dell monitor and should be running @ 2560x1600.i went to control panel and screen res and it detected that it could handle 2560. tried to change it, screen flashed and went back to 1024. strangely, it asked me if i wanted to keep my setting - as if it worked. it (for some insane reason) recommended i run @ half res - 1280x800. changing to that workedi tried the catalyst control centre (i have 8.12) and that did the same thing. had to reboot. once that happened it booted normally. as in running at the correct screen res.hasnt happened before and i have been running this as my main PC since i installed it a few days ago (32-bit)the gpu is a 2400XT btw running via dual link DVI

Have you checked to see if an updated driver has been donwloaded through windows update? If it has try rolling back to the one installed initially and working