Apple hardware test form recovery boot, hold command R on reboot
New MacBooks can access HardWareTest by rebooting holding the D key, no disk required.
The key combination varies between systems, but should be one of the following on your Mac:
- Option + D (Early 2011 and newer; Mountain Lion tested)
- Command + D
Quick way to tell if the problem is with the gpu (graphics card) or the display panel itself - connect an external display to your MBP.
If the problem also occurs on the external display, the gpu is probably at fault.
If the external display is fine but your MBP display gets fuzzy, the MBPdisplay panel is probably at fault.
How old is your MBP (what model), and is it still under warranty or AppleCare?
Any of the following apply to your model MBP?
MacBook Pro: Distorted video or no video issues . The affected computers were manufactured between approximately May 2007 and September 2008.
MacBook Pro (15-inch, Mid 2010): Intermittent black screen or loss of video. Affected computers were manufactured between April 2010 and February 2011.