Black Screen with white underscore

Question

The problem appeard after i turned off ubuntu from the power off button of the computer ,I think there were some things going on . Now when i turn on my computer it starts but short after that i see a black screen with a white underscore blinking. I inserted a bootable usb with ubuntu , ended up partitioning de hard drives, installing the system and when i press ok on the message to restart the system so that the instalation be completed i end up at the ssame white underscore blinking , doesn't goes any further .. When i try to enter bios by typing tab it seems like it's preparing some output is printed on the screen but it's stops and return to the black screen .I can acces my system if i enter the boot priory section and choose the drive that is ubuntu installed on .. I've tried to install it on another partition and i get this:Sorry an error occured and it was not possible to install the bootloader at the spcified location how would you like to proceed choose a different device to install the bootloader on , continue without bootloader ,exit