iMac updated and wont turn on. Help !

[Tomo-Murphy]

Hi

I checked for an update on the Mac. It updated itself and now will not turn back on. If I try to turn it on, a loading bar comes up with a rotating circle over it, the loading bar doesn't move and it turns itself off.

Please help

 

[simsaladimbamba]

Have you tried any of these steps?

Mac doesn't boot
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
Troubleshooting: My computer won't turn on​

 

[Tomo-Murphy]

I've tried one or two. Cant start it in safe mode for some reason and now the fan is running loudly

I would imagine it's because I only have a bluetooth keyboard and the bluetooth wont work until it starts up

 

[Arty Mac]

... If I try to turn it on, a loading bar comes up with a rotating circle over it, the loading bar doesn't move and it turns itself off....

Such a familiar story! I had exactly this problem, and found that on taking the Mac to a repair guy, the hard drive was 'puckerooed' (as he so eloquently phrased it. Dare I say it but check this out as an option. Have a look at my post and see if it rings any bells. GL.