New PCs as you've probably seen ship w/ Windows 8. I've managed to figure out how to get Windows to run in a lower resolution, but even @ 800x600 60hz I get out of range. I could have sworn this monitor had no issues with that size and even 1024x768 for vector games worked for me.
From what I can tell there is no way to disable the UEFI splash screen/POST which seems to run at a resolution of 1280x1024. No harm seems to be done to the monitor, but if Windows can't run at 800x600, I have issues.
Anyone else wrestling with this stuff?