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backlight problem with my acer laptop


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hi guys, hope someone can help me with my problem


I have a laptop

Acer aspire 4820TG timeline X

core i5-460M

2.53Ghz, 3mb L3 cache

with switchable video card, you can turn on the intel built in video card and you can also switch to ATI mobility Radeon HD 5650 1gb.

4gig ram 

640gb hhd


my problem is that when i play heavy online games using my 1gig video card, my backlight just suddenly turn off, but my computer is still on, only the backlight just went off, i tried pressing Fn+f6 but no luck, i can still see graphics in my laptop if i pust some lights in the screen, i also plug a monitor in my laptop, all went good when i plug the monitor, and when i switch to the built in video card of intel, my backlight just turn on, i have no problem when using my intel built in video card. it just that when im using my 1gig videocard ( ATI mobility Radeon HD 5650) sometimes my backlight just went off,


hope anyone can help me.

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