How can i switch off an acer which has a blank screen

Hello Edna Mbogori;

Without knowing why the screen is blank it's hard to guess at the corrective action needed.

But some common problems and possible solutions:
Replace a malfunctioning FL inverter which powers the CCFL backlight in the LCD screen.
Replace a malfunctioning CCFL backlight in the LCD screen.
Replace a damaged or non-working LCD screen.

If the reason the screen is blank is due to a bad video chip on the motherboard - you'll need a motherboard replacement.
 
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