Acer v5 571G bios

Hello there;

My operating system is down now. I am trying to enter the bios I tried F2 and Fn+ F2 and also F2+ power on but nothing seems to work. I want to enter it to do some diagnoses and to make the boot from a CD. Is there any other trick might help to get to the bios?
I actually tried everything....

Thanks in advance

F12 should have given you a boot menu, and F2 should take you in to BIOS. Most of the times it's just a timing issue when to press these buttons. Usually while boot logo is displayed. Press these buttons repeatedly after powering on until (in case) "operating system not found" is displayed.

If the o/s is trying to load its a known problem as its too quick start pressing key before you turn on and just keep hitting it

Thank you for your reply. I figured it out and I replaced the OS and the bios is restored now.

Thank you again