Dell Latitude D631 (Early 2009) - Manual (Page 100)

100 Troubleshooting
R U N TH E V I D E O D I A G N O S T I C S T E ST S — If no error message appears and you still have a display problem,
but the display is not completely blank, run the Video device group in the Dell Diagnostics. If the
problem persists, contact Dell (see "Obtaining Assistance" on page 139).
S E E "E R RO R M E S SA G E S " — If an error message appears, see "Error Messages" on page 86
If only part of the display is readable
C O N N E C T A N E X T E RN A L M O N I T O R —
1 Shut down your computer and connect an external monitor to the computer.
2 Turn on the computer and the monitor and adjust the monitor brightness and contrast controls.
If the external monitor works, the computer display or video controller may be defective. Contact Dell
(see "Obtaining Assistance" on page 139).