Instead of booting regularly see if booting into safe mode will work
If that fails, see if you can get BIOS.
If BIOS does work, you can recover your files with a linux boot flash drive- instructions: http://www.everydaylinuxuser.com/2014/05/how-to-create-bootable-linux-mint-usb.html
If you cant enter BIOS either, I'd have to say its broken.
Also, what PC are you using?
Instead of booting regularly see if booting into safe mode will work
If that fails, see if you can get BIOS.
If BIOS does work, you can recover your files with a linux boot flash drive- instructions: http://www.everydaylinuxuser.com/2014/05/how-to-create-bootable-linux-mint-usb.html
If you cant enter BIOS either, I'd have to say its broken.
Also, what PC are you using?