My computer was working just fine this morning but when i got home today it wont boot windows or really anything. It shows the motherboard or processor wallpaper type thing when it first starts up just like always but after that it goes straight to a black screen with a white flashing bar in the top left hand corner. Its kind of like a command prompt. The only thing i can really do is press ctrl alt delete and that just restarts it. None of the f keys at the top work or anything.
I also have a back up of Windows on an external harddrive but im not sure how to boot windows from that since nothing is loading. The computer is only a few months old and has worked great up untill now.