Hey, I recently put my macbook into service at Apple to repair my screen, Only issue was my screens hinges were very lose. So they only needed to tighten them. They told me my macbook was working perfectly without any issues both external and internal. Once i got my macbook back, I've not been able to screenshot anything. If i screen shot something, The picture will come up as usual but the photo will be all messed up, Completely unreadable. I've never had this problem accrue before. Any tips or advice?