Lenovo ThinkPad 600X TP 600X User's Reference - Page 146

Troubleshooting guide Message An error prompt Cause and action Test the computer, using PC-Doctor. If the test ends in an error, note the error code and have the computer serviced. You can start the operating system by pressing F1 instead, and ignore the error. The DOS full-screen looks smaller. 640 x 480 A panel or message that is not listed in the troubleshooting charts. xxxxx KB OK appears and the computer stops. If you use a DOS application that supports only 640 x 480 resolution (VGA mode), the screen image might look slightly distorted or might appear smaller than the display size. This is to maintain compatibility with other DOS applications. To expand the screen image to the same size as the actual screen, start the ThinkPad Configuration program and click on LCD ( ); then select the Screen expansion function. (The image might still look slightly distorted.) Note: You can use the Fn + F8 keys to do the same thing if your computer has screen expansion function. Test the computer, using PC-Doctor. If the test ends in an error, note the error code and have the computer serviced. Have the computer serviced. 124 IBM ThinkPad 600X User's Reference