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Problem Dell precision M6500 if Adapter plug in the screen Going Black but the HD still on

Dear All.
Please help me. I have Laptop Dell precision M6500. I got problem. If I plugged in the adapter, the screen got black but the other still on. After that i turned off the laptop manually with push the power long time. Then i turned on the laptop again. The laptop got normal again. Sometimes the laptop got normal if the adapter plugged in. Sometimes the problem got back.. Please help.
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