2 Problems after replacing PSU
My EMC 2390 (mid-2010 27”) iMac had a dead PSU. After replacing the PSU with one from iFixit, firstly the fans go crazy (I know have to use Macs Fan Control which I didn’t before) but most annoyingly the iMac’s display blacks out, then the iMac goes to sleep, after about 30 seconds. I read a comment from another poster who had the exact same issue and advised resetting the NVRAM on boot - this works for me as well, but like that poster I have to do it every time I boot or else the problem reoccurs. I’ve tried resetting SMC also with no improvement.
I am thinking it’s something wrong with the iFixit PSU, but not sure. Would appreciate any guidance!
Edit: added screenshot of TG Pro
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Restart your system and press the D key to enter into the onboard diagnostics, did you get any errors? Let us know what you got.
Reference: Mac startup key combinations
Dan tarafından
@danj thanks for your response!
Couldn't run Diagnostics - doesn't appear to be on my machine - but was able to run Apple Hardware Test via a bootable USB.
Only one error - 4M0T/4/40000003: HDD-1314 which looks like an issue with the HDD fan? I no longer have a HDD, replaced with a SSD a couple of years ago. HDD fan is not the one that is going crazy - it's the CPU fan.
Graeme Lobley tarafından
Whennyou changed the hard drive, did you do anything to take care of the thermal sensor?
mayer tarafından
@mayer I added the OWC In-line Digital Thermal Sensor Cable when I changed the HDD to SSD. I did that change 4 years ago, and the iMac has run with no issues until I replaced the PSU. Now I have the iMac going to sleep and the CPU fan running crazy.
Graeme Lobley tarafından
I am having the same issue after replacying the PSU of my iMac 27 Mittel 2011.
After few (many) reboots iMac runs smoothly.
The issue occurs always when I turn the iMac on for the first time.
amontanheiro tarafından