4800 HD (250-3539) Using the VGALOCK.EXE Utility Faxback Doc. # 1396 Some applications might incorrectly identify the VGA system in your computer. If this happens, the application might display incorrectly, or might not display or run at all. You might be able to run the application by locking the computer's video mode to standard VGA with the VGALOCK utility. To do so, type the following from the C:\ prompt: CD \CLUTIL <ENTER> VGALOCK ON <ENTER> To unlock the video mode, type the following: VGALOCK OFF <ENTER>