my sisters macbook has been running slow while, , screen stays on no longer 10 seconds, , on have close screen few seconds, open , press enter. , seems running slow. apple hardware test says there nothing wrong it, , have no ideas wrong or how fix it, appreciated. thanks.
could number of things. either hardware or software @ stage. can boot osx disk , attempt repair disk permissions?
if black issues dont happen, software - if continue happen hardware (hard drive or cpu/gpu).
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