Last night when I shut my Lenovo, WINDOWS 7 Professional,  desktop down everything was running fine, however, this morning when I STARTED it up, there is a black band, about 1/2" wide at the top and bottom of my main monitor.  I run dual Acer monitors, an AL1906 & an AL1916.  The bands are on the AL1916.  I tried pushing the buttons at the bottom of the monitor to see if there was any way of adjusting the screen, however, if it is there, I couldn't figure it out.  The monitors are probably from 2006 & 2007 and are used nearly everyday for at least 12 hours a day.  I don't know if this is a problem that could be a sign of it getting just plain old & TIRED or if downloading a driver for it would put it back to normal.  The Video Card is a NVDIA GeForce GT 430 that I installed when I got the computer about 8 months AGO as it did not have dual monitor capabilities.  Thank You,It's possible that, under your graphic card settings, you have 'Keep Aspect Ratio' enabled.

It's also possible that the display resolution has been altered slightly. Thank you, Carbon Dudeoxide, for steering me in the right direction.  I found the NVDIA settings, and for whatever REASON, the 1916 monitor was set at 1280 x 800, while the 1906 monitor was set at 1280 x 1024.  I changed the settings on the 1916 to the higher setting, and the black bands disappeared.  Problem solved.Good job! Glad to help!