iMac (mid 2011) Shutting off in the middle of booting up
I reformatted the hard drive of our iMac using the disk utility and re-installed the OS.
It worked for a day and now every time we turn it on we get a chime, the Apple logo shows up about half way through the boot up it shuts down (never booting up). I tried to access the disk utility but it doesn't show up. I think the reason for this is because the system doesn't stay on long enough for it to appear. I have tried turning it on safe mode and same thing happens. It stays on for about a minute and then shuts off.
My question is this: Is it possible that this is a hard drive issue or do you think the CMOS battery needs to be changed? Could it be overheating? Is there a test I can do to be sure?
If its a hard drive issue and I replace it, how would I install the new OS into it?
Thank you Dan and Mayer for responding to my inquiry so quickly.
I did try safe mode as well but it also turns off half way through loading.
The iMac was working perfectly fine up until I reformatted and re-installed the OS (Sierra).
I failed to mention that I had a tough time erasing the hard drive and it took a few tries to get the OS installed. I remember getting to the setup screen and it did turn off after a couple of minutes. This is why I thought the issue was with the hard drive because maybe the OS was not installed properly.
I mostly work with MS Windows so I am very green with it comes to the Mac hardware.
I do have a Mac Pro so would it be worth it to connect it to that and use Target Mode? Or is my best chance just take it to a Pro and get them to test it for me?
Is this a good question?