Question about Dell Inspiron 8200 Latitude C840 Laptop Keyboard03J247 CD-ROM Drive

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My laptop screen keeps on switching on and off and on and off and on....

Hi,
I have a Dell inspiron 8200 laptop since 2001 ( I don t know the exact model type, so am not sure about the C840 thing below). It has 512 Ram and 40 Giga harddrive. Last november, the screen randomly started switching between on and off about every second. Sometimes it would just freeze completely.
The only solution is to switch the computer off.

I have tried various fixes and don t know what to do anymore:
in safe mode, I have never had any problems.
I have run the Dell diagnostics Cd (even the slow one) and that passed all the tests.
I thought it may be the batteries/ power related.
I have checked antiviruses with avira.
I even formatted and reinstalled everything, and updated the drivers. I thought that had fixed the problem, because after that it was only freezing some times, but was not having the screen on -off switch anymore.
But the switch on and off and on etc thing started again last night, and I now just don t know what to do anymore.

Do you have an idea what it could be?

Thanks and Regards,

John-Frederick

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  • 998 Answers

The problem your having appears to be with your video circuit. Depending on your model's options this would consist of 1) LDC panel display, 2) video card or on board video controller, 3) LCD ribbon cable. If your laptop has an external video adaptor port, connect it to an external monitor and see if the problem occurrs. If the problem happens on the external monitor then your laptop LCD display panel is probably OK. If this is the case, you'll need to diagnose the problem further or take it to a repair shop. The reason it seems to work in safe mode is that the video circuit is not being fully utilized, ie.. no wallpaper, screen saver, etc..

Posted on Oct 16, 2008

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