Thanks Apple, for finally fixing my MacBook Pro!
Three years ago I bought a new MacBook Pro . About a month after I bought the machine, it developed an odd problem: it would lock up, the screen would go on the fritz, and then it would shut down or freeze. After this happened a couple of times, it stopped booting entirely. I took it into the Apple Store and they decided it was the hard drive. [ They also thought it might have been my fault for installing a piece of software that wasn't compatible with that version of OS X, but we won't go into that. ] They replaced the hard drive. Two weeks later, it started happening again. I took it back, and they decided it was the graphics card, so they replaced the entire motherboard. This took several days, during which I had no computer, which may explain my later behavior... After that, the machine worked, except for one problem; every now and again the screen would flicker - or have a black flash - that was about as quick as your eye blinking. It was enough to be noticeable, but...