I have problems displaying resolutions above 640x480. Until recently the very same computer, graphics card and monitor used to operate just fine. On another computer the monitor still works as expected.
I recently got a new PC, and up until now there has been no problem switching between my old PC and new one with my Dell monitor (and keyboard/mouse/speakers). All the parenthetical items work fine, but my monitor now refuses to display on the old PC unless I boot in VGA mode. Both are running through video cards, but the older PC refuses to display any resolution above 640x480. I can't imagine what could cause this issue - I haven't changed or installed anything since the last time I used this monitor with the older PC. I have been able to switch between the two computers with no problem previously.