not detecting display

[thebtone]

for some reason my computer stopped detecting my monitor thus morning. it is a acer 2216w 22inch display. i am running a 8800gts. now it is only picking it up as "default display" and will only allow a 1024 x 768 resolution instead of a 1680 x 1050 resolution

http://i84.photobucket.com/albums/k26/thebtone/displaysettings.jpg

does anyone know what i could do to get my monitor back to normal?