Buzzing noise, turns louder when brightness is up
A couple of months ago I upgrades my iMac 2017, 21,5” model with a SSD and RAM.
It worked perfect. I was running BigSur. After the BigSur update from 11.0 to 11.1 I’m hearing a buzzing noise. I first I tought it was the fan, but I dont think so. I installed ‘Macs Fan control’ and turn down the speed. The noise didn’t go away/decrease.
When I decrease the screen brightness to almost 0 then the noise is almost gone.
What could it be?
I didn't repair the Mac. All functions were working, noise didn't get louder so I went with it.
After working on the Mac I shut it down and after 45 minutes I want to start working again…The Mac did not start up. Nothing, no noise, connection, screen. Also disconnected power cord.
What to do? Replacement of PSU?
Can you determine which area in the machine the buzzing noise is coming from?
由 Zachary Lunte 完成的
Bottom left corner I think
由 Rob Smeets 完成的