I unpluged my viewsonic VG2030wm

Question

I unpluged my viewsonic VG2030wm the other day. The day after I turned on my computer///forgetting to plug in the monitor....so I did that while the computer was turned on. As soon as I did this the resolution was terrible. I have the latest drivers intalled for both the monitor and the graphics card. I am able to get the srceen resolution back to normal by unplugging the dvi cable and plugging it back in......but the monitor goes back to bad resolution eveytime I reboot...or the computer goes into hibernation....!!!Please help