Random reboots and freezes on end 2009 27 "iMac

iMac (27-inch, late 2009)

Intel Core i7 2.8 GHz

8 GB 1067 MHz DDR3

ATI Radeon HD 4850 512 MB

Random freezes usually when Safari is running but not always - Random reboot to gray screen - multiple messages indicating problem with function sleep-wake

I have;

Re-installed OS 10.11.4 several times

Erased the hard drive completely by booting from a USB key

Run the system for several days without any migrated data or no additional program outside the standard OS X installed programs.

Reset the PRAM

Unfortunately, I can't start diagnosis Apple when restarting.

I perform diagnostic tests according to the Linc Davis post with the results posted to the pastebin. See the link below.

Random freezes and...

Thank you and very grateful for any input...

You seem to be dealing with a hardware failure.

Do a 'genius' one appointment at an Apple Store, or select another authorized service provider. You may need to leave the machine there for several days.

Back up the data on the internal disks before you turn on your computer to anyone. There are ways to back up a computer that is not fully functional - ask if you need advice.

If privacy is a concern, delete the partitions of data with the ability to write zeros * (do it only if you have at least two backups complete, independent, and you know how to restore on a blank disc from any one of them.) Do not delete the recovery partition, if it is present.

Keep your confidential data safe during the repair of the equipment

Apple recommends that you remove permission to a device in the iTunes store before serving.

* One SSD has no need to be set to zero.

Tags: Mac

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