Dell Inspiron 1521 LCD/Power Supply

Hello,
I have a Dell Inspiron 1521 that has a dark screen when I use my power supply. If I reboot the computer and only use my battery, the LCD works properly. Any ideas as to why this is happening would be greatly appreciated.
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  1. I have exactly the same problem. If you have a clue why, please email to hongwong@yahoo.com. thanks.
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