Question: Can't boot my MacBook Pro, Early 2011. Suspect disk failure. or Corrupt OS.
My early 2011 MacBook Pro won't boot. Get the Apple Logo and the progress bar moves to about 90% and then shifts to a white screen. Can't boot in Safe Mode. Recovery Mode says memory and mother board are OK. That seems to be intermittent, as I can't always get it to run that diagnostic. Can't get into the actual Recovery screen to run Disk Utility. Tried resetting PROM, didn't change anything. Was able to get the Internet Recovery to work a couple of times. It seems to be intermittent. Acts like I have a failed hard drive. Can't find a way to test it.
How can I be sure my disk drive is bad? Tried Verbose Mode but couldn't read the screen fast enough. Any way to stop the scrolling so that I can read the messages. Looked for a disk error message, but couldn't see it.
How can I be sure my disk is bad? I suspect it is from the above testing.
Can a corrupt OS cause these kinds of symptoms. Got tricked into loading a video player from the same people that want to download Mac Cleaner or Mac Keeper (not sure which). I didn't let it download MacKeeper or any of the other junk. This problem started after I had installed their player. I suspect some type of malware. If so, how do I restore the MacOS. I'm running Sierra. Can't get the system to boot at all.
MacBook Pro, macOS Sierra (10.12.6), 8 GBytes, 750 GByte disk, Early 2011, i7 quad core