Hi, I'm new here so I hope I'm posting this on the right place. I have a macbook 5,1 (late 2008) which was working really fine. Unfortunately, recently it started to freeze. It doesn't do it all the time but it is specially after waking up from sleep. When that happens sometimes, but not every time, green (or other color) lines appear like in the image bellow. Also this just happend while rebooting after it froze: Notice the weird thing going on on the left of the screen as well as the startup sound repeating itself! Here are the specs of the mac: MacBook (13", aluminium, late 2008) 2 GHz Intel Core 2 Duo 8 GB 1067 MHz DDR3 NVIDIA GeForce 9400M 256 MB MacOs 10.11.6 Does anyone have any idea of what might be causing this? Thank you very much!