Use the Alt-F10 key combination.
This brings you to the factory reset menu.
Somewhere there I found an option to get into the UEFI settings and thus the BIOS.
Thank you rechar2. My Acer A5 was bricked for weeks, but it responded to Alt-F10.
F2 on startup worked until I upgraded to Windows 10, then when I turned off UEFI to boot from USB I couldn't get back to BIOS, which I supposed was only accessible via Windows which wouldn't boot. Acer support wanted £47:50 to send it back for a quote, so either they don't know your solution or they're on the make. I was about to strip it down to get the disk out.
Thanks again.
my acer aspire 4739z laptop didn't work f2 key now i need to i access boot menu please help me any alternate way to go boot menu..
Hi, i'm Felipe (Brazilian) and have the same problem. F2 doesn't work. I solved putting a PENDRIVE BOOTABLE with WINDOWS 7 on USB port and after that the Acer logo appeared. Typing F2.
Just put pendrive and boot again typing F2. It work's!
here are some examples of common computer boot menu keys: Acer F12,Asus Esc or F8,Compaq F9 OR Esc, Dell F12 dell mini uses 0,Fujitsu F12, HP F9 or ESC, IBM F12, Lenovo F12,Samsung ESC, Sony F11,Toshiba F12.