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I would take it to a shop sounds like the "tech" was not qualified to repair the issue. If you are getting pic to an external then the vid card and gpu are fine check the power lead from the board to the monitor.
Do a simple test - Try connecting it to an external monitor or LCD monitor (at work, a friend or neighbor's) - if you get the same thing on the LCD and external monitor, then you've got bad on-board video (MB); if you only get abnormal output on the laptop's screen and the external video is fine, then it's likely a bad screen...
you connect the external monitor & nothing is displayed on it, then
this means that both the backlight lamp & the inverter board are
fine. The main indicators in these cases are the sound, and the hard
drive LED on the laptop's case. If the laptop sounds just like it
does for a minute or two after being turned on, it means it's going
ahead and booting the operating system, but the video processor or part
of the motherboard circuit for video output has failed.
What type of Video Card in in the laptop? check the laptop case on left side of keyboard sometimes stickes are there saying what type. I have seen ATI Mobility cards in laptops that have all the software working on the machine properly, but the display driver is either bad and cirrupt and causes the machine to reboot, or its a fualty video card that can cause the machine to crash.
Easy way to check, boot the machine and as windows XP boots press the F8 key (this enters safe mode) when menu appears choose safe mode with networking. and let it continue. if it boots up and continues to a display and doesn't crash, the video driver is bad. then just uninstall the video driver, then go to the nabufacturers website and download a new video driver for your model laptop.
possible issue would be the LCD, video controller/card or motherboard. Connect an external monitor to the laptop. It works fine and the computer boots properly, it will be an issue with the LCD. Request an LCD replacement if in warranty, otherwise, purchase one. If same issue with external monitor, check for signs of system booting up. Listen if you hear the welcome sound that you usually hear when Windows has successfully loaded. If you get this, request a replacement for the video card. If video card is integrated to the motherboard, request a motherboard replacement.
Try connecting an external monitor to the Dell Latitude D820. If the monitor display is fine, then your laptop’s LCD display panel is defective. If the monitor has no display, then your problem is with either the video card or motherboard located inside your laptop.
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