My teclast F7 worked fine until last week, when the screen went black except for the top left corner where it says: EFI Shell version 2.50 (see picture).
I have looked on the web but my knowledge is limited and I don’t really know what happened or what I can do to about it. Any help is welcome. Thank you.
Switch on computer and press the delete key until you enter the Bios. Change the start up sequence to make Windows boot manager at the top of the list, save and close bios. See if that works.