- I installed the OS and it was running perfectly. However, I had to restart the computer so the OS updates could take affect. When it was updating the macbook pro froze. I was forced to shut it off by holding the power button for 10 seconds. Then I tried to turn it back on, but it seemed the system was not booting so I decided to reinstall the hard drive. I reformatted the drive but now whenever I try to reinstall the OS the macbook freezes in the middle of the install so I am not able to successfully install the OS. I suspect this is a hard drive issue or the PRAM just needs to reset. What do you guys think? How much would it cost to go the problem?