Thank you! I'd already taken all the steps mentioned and couldn't figure out why my screen was stretched at 1280x1024. I changed from VGA to DVI and now it's working, even though I have a couple of inches of black space on either side, hopefully when I get a new monitor with HDMI I can sort that out. For the record I'm using a GT-610 with a LG W2343T Monitor on 10.9