My Acer Extensa 5620Z originally came with Vista, then I clean installed Win 7, now upgraded to Win 8. Since the latest upgrade, I am unable to access BIOS or the boot menu. The black and white boot screen used to say to press F12 for boot menu, and something else for Setup, those messages are no longer there. And those key combinations do not work. I've also tried some other combinations I've...
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