I know this thread is a little old, but I just had the same issue with my eby701.
as a previous poster said, went for the brightness button, hit auto adjust by mistake and blammo! Out of range.
Got it running at 1024, but didn't like the itsy bitsy windows.
So I started fooling around with settings. Tried changing hz first. nada.
Then started fooing with an old nvidia agp card I had lying around. Still no 800x600. but 848x480 (but acting funny) and 1024 (too small).
Then I tried a bit more unusual setting. 960x600. Success! But the odd thing is, the OSD says it is running at 800x600!?!
Time to start resizing my jpegs.................
Maybe I'll start fooling with powerstrip and see what's what........
Hope this helps someone out there somewhere.