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Unable to Turn On

I have an old Acer laptop of friend of mine called Extensa 4120, this laptop unable to turn On, I checked the voltage of the power adapter, battery, battery connector and the DC power jack with a multimeter and it shows the exact amount of voltage which is written on the adapter Label. The only thing which is working in this laptop is the LED of the Power and it is blinking. WT going on.

25 Jul 2016
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