Hi folks! My mother has a Macbook Pro 17" - Late 2011. Today she came to me and showed me some weird green lines when she boots her Macbook. They're only visible when you see the Apple Logo, afterwards thery're gone. But that's not all, it won't go any further than the Apple Logo. I also saw that there is no Recovery HD available when pressing ALT. But, what I tried this far; Normal boot Boot with ALT (no Recovery HD seeable) Boot with CMD + ALT + R (forcing to use Apple's Server boot image) Boot with CMD + ALT + P + R (Gives a weird black line, but nothing else) Diagnostic test (won't run) Startup with Safe mode Resetting SMB When I tried to boot with CMD + ALT + R, I got to choose my wifi and he begun downloading. After downloading I got a grey screen. I always end in a grey screen. Is there something I missed, or anything I can do to completely wipe my macbook. All files are already backupped.