Boot hangs at Apple logo with progress bar
Hi all,
My early 2011 MacBook Pro will not complete the boot process. I shut it down normally last night. This morning, pressing the power button resulted in the following:
- Chime
- An abnormal boot screen: a little more blue than usual, the Apple logo is in a box, and appears to have only half the pixels.
- Progress bar advances very slowly, also has the same odd appearance.
- Apple logo and progress bar vanish.
- System reboots.
I tried holding down the option key to boot from a different volume. All the attached disks show up, but are hard to read because half the pixels are missing. I select 10.6.8, but the same boot problem, but without the reboot. I had to hold the power key to reboot it.
I tried booting into safe mode - same problem. I put a weight on the shift key to hold it down while I did other things. I returned about 10 minutes later to the same grey screen. While I could hear the disk spin, I did not hear the heads moving, so I assume nothing was being read nor written.
This is an early 2011 MacBook Pro, running 10.13.6, security update installed about 2 weeks ago.
Thanks in advance for any guidance you may provide.
MacBook Pro 15", macOS 10.13