Hi, not too long ago, I posted a review about my Macbook, and the overall conclusion was positive. However, just a few weeks have passed, and now my Mac is having some serious issues. These 3 are the most annoying, and I don't know if they are related or not. 1. Screen brightness. Sometimes, the brightness of my screen decreases and fluctuates quite a bit (it is becoming very noticeable). This seems to be a software issue, as adjusting the brigthness helps the problem (first decreasing the brightness 1 step, and then increasing it 1 step). 2. Sleeping. Putting the laptop to sleep by either closing the lid, using cmd opt eject or the Apple menu, puts my Macbook in some sort of semi-sleep, with active fan, continuous white LED and reactivating in half a minute or so. Also, closing the lid, then reopening puts the Mac to sleep (after which I can close the lid again) 3. Shutting down. When shutting down my Mac, I get a black screen, but the LED stays on and the fan still runs (and even increases in speed). This requires a shut down by holding the power button. I have restored disk permissions, and I have no hacks, or recent software installations that could have caused this problem. Please, help me, I really intend on keeping my Macbook for at least another 2 years. Thanks in advance !