This sounds like a software issue but I can't offer any ideas as all I have for information is the symptom but no make, model, operating system and whatever else can be offered.
So my laptop was working fine yesterday, I went to turn it on last night tho and it turned on but was just a black screen. I left it over night and tries again this morning, same thing happened, except this time it tried to repair itself, it failed the first time but worked the second time. My laptop is working, but I can't use it. When I go online no writing appears just the frames and even on my computer settings I can just see boxes and no writing, I don't really know how to explain it, I'm writing this using my iPod as I really can't use my laptop. Help I greatly appreciated!!