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Have you considered doing a fresh install via USB? Assuming you haven't just been updating over operating systems since 10.8.3.
 
This really made me very sad. I was still running 10.7 and forgot all about the discrete issue in 10.8.3 and went ahead and installed 10.9. As soon as a window opens, the nvidia chip kicks in. The laptop becomes incredibly hot and battery is being drained.

10.9 is unusable like this and I wanted to go back to 10.7, but the app store won't let me download it :mad: Now I'm stuck with 10.6, which came on dvd with the machine.
 
Have you considered doing a fresh install via USB? Assuming you haven't just been updating over operating systems since 10.8.3.

hmm. that's the last option.. but it seems that the issue is something that a fresh install potentially could not resolve
 
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