I have a macbook pro with OS X 10.9.2, 4gb ram and a few days ago ot started to get really slow and the screen turns gray every 1 minute or 40 seconds. When it does that the dock hides and then reappears. I have tried killing all open apps and many kinds of hard reset. The HD is almost full(2.43gb free). I dont know what to do to fix it, mainly because i dont know what it is. I dont know what cause it I haven't installed new apps or software updates. Thank you for reading. I'll appreciate your help.
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Problem unknown. Please Help!
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Maybe start by moving some stuff to an ext HD. Having only 2½ GB of empty space is not good. The mac OS needs way more than that to allow it to accomplish all its background processes.