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My iMac 27 Intel Core i7 OS X Yosemite Processor 34 with 2 HD discs keeps restarting every time I turn it on. My iMac 27 Intel Core i7 OS X Yosemite 10.10.3, Processor 3.4 with 2 HD discs keeps restarting every time I turn it on. Sometimes it doesn’t get to the desktop before restarting, other times it restarts while I use it. But, it does not restart, when using disk utility program. When it restarts, it randomly shuts off and then boots again automatically, sometimes over and over, sometimes five or ten minutes later. The problem has begun after test & video card replacement at Apple store service (“Gatortech” in Gainsville, Fl.) The guy replaced video card and asked me to replace power inverter. I didn’t get it why and what for, until I got home and turn on iMac. First of all, I didn’t change anything in my iMac using it for 5 years without problems since I got it from the Apple factory. No external devices are connected. No new memory installed or replaced. No any software installed from manufacturers other than Apple. Always use the “Monster” power supply to connect to the wall outlet. I have tried everything: diagnostic hardware, Apple Hardware Test, reset PRAM, reinstall OS to the initial, reinstalled previous OS X version, uncheck “Automatic restart…”, recovery both HDs, Mount & Unmount HD, was trying to solve the Spotlight problem, even reformat drives making partitions - the problem exist. Never get alert message like “You shut down your computer because of a problem.” Appear. Any meaningful advice would be appreciated. Thanks
First let make sure I selected your exact machine. You really need an explanation from the Apple Store for the repairs made. Why (under what program was the GPU replaced? Why did you have to replace the power inverter and just where is that in this machine. There is an LED driver board. This explanation makes no sense to me. I would love to see the invoice on this and I feel you’ve been baffled with bullshit because I’m certainly baffled. How much were you charged for this mysterious repair? Do you have a case number on it? Do you have an invoice and would you post it? Were you told it was repaired? Is this an ASP or an Apple store? Have you called and asked about it. Were you ever shown a working machine. Have you made alterations to the machine? Is it covered under AppleCare? Here’s the program that I’m aware of: https://support.apple.com/en-us/HT203787
