I installed elementary os freya x64 in dual boot with Windows 10 pro x64, while installing I create four partitions: /, swap, /home and biosgrub. after installation I tried elementary for some hours but it was running too slow (my notebook's fault), I decided then to boot from windows, grub and all was working fine. Once in windows again, I decided to remove elementary from the disk management, I just deleted the four volumes I mentioned before, I created a new ntfs partition with that free space. Everything was fine, I continued working as normal. Turned off the computer, I went to sleep. Next day (today) when I turned on the notebook I found this grub "terminal":
GNU GRUB version 2.02~beta2-9
Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completion. Anywhere else TAB list possible device or file completions.
I restarted the pc, tried to enter the bios setup, which i normally do by pressing F2, but it didn't work, the strange thing is that the first screen when i turn on the pc show the ACER logo and in the bottom shows: press F2 for setup. But now it do not show anymore. I cannot enter the BIOS setup. I tried to boot from live CD or windows 10 installation disc but it just make the noise of loading the disc and takes more time but always return to the grub terminal. I tried some codes I found in some forums, but they didnt work. =(