Hello,
I have problems with display on my iMac 27 2011. There are strange things on my display and iMac turns off and restart. The program Apple Hardware Test gives me the number of the error: 4SNS/1/40000000: THOO-9.000
Please, help me with it. What kind of error is it? How can i solve it?
iMac, macOS Sierra (10.12.6)
Check System Information and see what graphic card is installed? There was a recall of that particular model, (iMac12,2), for bad AMD Radeon 6970M cards.
Unfortunately the recall has be discontinued, it was good for 4 years from the date of purchase.
So do what rkaufmann87 suggest and take in into Apple for a free diagnostic test.
Likely a failed or failing fan or fan sensor. Take the computer to your local AASP to be repaired correctly.
Problem with display on iMac 27 2011
