I was browsing the forums to see if anyone was experiencing an issue similar to mine, but I was unable to find one quite like it.
I recently purchased a new system along with a Visiontek Radeon 4850. It works great in my dual monitor setup and everything looks great. I am just having a problem where the screen will flicker almost like a strobe light. It happens only when the monitors have automatically turned off and I am prompted for my windows user/pass. After I successfully enter the password and get to my desktop, both screens immediately being flickering to the point where i have to look away because it makes me dizzy. Another "funny" thing is that it seems that the longer the monitors are "asleep," the longer the flickering occurs. For example, I just stepped away and it only flickered for like 3 seconds. However, when I came to the PC after I woke up this morning and logged in, it was flickering for almost 1 minute. After it's done, everything is fine again but I fear that one day it's not going to stop. I have the latest drivers installed and would not dare touch anything that deals with overclocking. I would appreciate any help on this matter.
The issue is with the ATI Hotkey Poller. I have the MSI 4850 and have the same issue. Go into msconfig from the Run box on the Start menu. Go to Services and uncheck the ATI Hotkey Poller. You will need to restart.
You can google what the service does, but I have never used any of the ATI Hotkeys.
I have not checked to see if this still an issue under the latest Catylst Drivers/Hot Fixes. They may fixed it by now.