Can't finish Apple Hardware Test
I ran an Apple Hardware Test on my Macbook Pro yesterday and it didn't finish. Everything was fine at first, the probing ran quite fast, memory and logic board test ran smoothly too. However, it was stuck when the test almost finished. The description said : "Testing in progress". I left the test for about an hour and it still didn't finish.
Could it be a hardware issue or clean install will fix the problem? I've owned this Macbook Pro for about 3 years and have never did a clean install.
Oh, and yesterday my Macbook suddenly had a black screen while I was using Photoshop, as if it was in sleep mode. So, I manually shut it down by holding the power button because the black screen couldn't go away no matter what I do. I restarted it like 3 times and it went on black screen after the chime. This has never happened before. Do you think it has anything to do with the Hardware Test issue?
(sorry about my grammar, I am Indonesian)
It is a mid 2010 Macbook Pro
Processor: 2GHz Intel Core i7
Memory: 4GB 1333 MHz DDR3
OSX ver 10.9.4
MacBook Pro, OS X Mavericks (10.9.4)