Question:

Computer hardware. how to open bios setting in my acer aspire 4720z laptop i tried

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how to open bios setting in my acer aspire 4720z laptop i tried esc,del,f1,f2,f12,f10 but nothing works can please tell how to reinstall operating system .when i put cd in cd rom nothing happens...........when i open computer.........it starts up but none of the application respond to me ....iscan it for viruse but nothing sorted out ...........please help...................

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