Oh,my god, I finally find someone who has the same situation with me. My situation is not almost the same, it is exactly the same. My MacBook Pro is 2012 mid non-retina.
After the problem occurred, I tied to use command+option+r+p to reset PRAM. The first time the problem was fixed, but I restarted again, the problem was still there, and reset would never work.
I also tried clean install again, but it did not work.
I also tried the terminal entering the command above, it did not work as well.
I think it is not hardware related problem, because when I was using mavericks gm, everything was good. But after I installed the formal mavericks released two days ago, problem occurred. It may be a bug in new version system.
After the problem occurred, I tied to use command+option+r+p to reset PRAM. The first time the problem was fixed, but I restarted again, the problem was still there, and reset would never work.
I also tried clean install again, but it did not work.
I also tried the terminal entering the command above, it did not work as well.
I think it is not hardware related problem, because when I was using mavericks gm, everything was good. But after I installed the formal mavericks released two days ago, problem occurred. It may be a bug in new version system.
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