blue screen and gray screen
Every time I boot my Mac it gives me the apple logo at the beginning but then it turns gray and freezes and sometimes it reboot it self. I have tried to booth in verbose mode, as well as in Single mode, I can booth but that's it, I can't go further than that. Also in repair mode it loads but when I start doing something it gives me a blue lined screen, all the time. I can't access the hardware test mode, ando sometimes, in normal mode, it starts but when i finally get inside the OS, it gives me a few minutes and the blue screen appears every time. I'm deducting it probably will be the GPU, also I have found that this model had defective ones, is my assumption correct?
Thanx in advance for the help!