Hello
I have the same problem and just recieved some information regarding it........the info below came from.......
Monitor stuck in power save mode - Tech Support Guy Forums
Monitor stuck in power save mode
When I start my computer, the monitor is stuck in power save mode. The screen appears blank until I hit a button that shows that it is in power save mode and can be activated using my pc. I can't activate it though. I tried unplugging everything, but that did not work. I checked if my video card was in properly, and it is. I tried using my old video card, but the monitor was still stuck in power save mode. I even tried using a different monitor and it was also stuck in power saving mode even though it works perfectly on my sister's computer. My monitor even works fine with her computer. I tried clearing the CMOS, but that didn't work. I have no clue what is wrong. It was working fine yesterday
Someone recomended that I tried switching my ram around in the slots and it now works fine
Fixed
My son's monitor was stuck in power save mode. We did three things, so I don't know which one worked, but it fixed the problem.
After disconnecting the power to the PC, we dusted and vacuumed the inside. It was VERY dusty. We removed the memory cards and then reinserted them. Then I noticed that the monitor had been plugged into the regular monitor jack in the back of the PC, although we had a video card installed and it should have been plugged in there. We plugged the monitor into the video card and it works fine now.
i just wiped my hard drive and re did windows and was updating my windows online when my screen went black i moved the mouse but nothing i pushed a button on the monitor and it said monitor in power save mode activate pc what i did to get it to work is opened my CD drive and my screen came back on hope it might help someone
hope this works when i get home and for you also.........
Ati radeon power saving mode