YES, I had same problem entering bios acer aspire v5 571p. so I figured it out on mine. I have windows 8.1, unable to use any keys to enter bios. must use windows to get to bios. boot up computer normally, go to RECOVERY options, then ADVANCED options,>>>UEFI start up[select this] and it will reboot straight into the bios. good luck!!!>>>TOM B.