Hello there. Something very strange happened on my new iMAC. While i was doing something some glitches apperead on the screen. Then i rebooted my iMac. since then i cant login in the iMAC because at 80% of the progress bar the screen becomes yellow!! the whole screen.
I can boot in safe mode. i did the diagnostics for hardware problems, nothing seems to be faulty. i did reset the nvram through terminal (nvram -c).
Can anyone help?
iMac 27", macOS 10.15
Try resetting the NVRAM again using the traditional method as outlined in https://support.apple.com/en-us/HT204063 and another Safe Mode reset. If the problem persists, the next step is taking it to your your local Apple Store or AASP to be diagnosed.
Try resetting the NVRAM again using the traditional method as outlined in https://support.apple.com/en-us/HT204063 and another Safe Mode reset. If the problem persists, the next step is taking it to your your local Apple Store or AASP to be diagnosed.
That's about the point in the boot sequence where the Full Graphic Drivers get loaded & take over from the Safe Drivers.
Have you blown the dust out of the intakes lately?
What temperatures does this App report?
This App can be used to speed up the fans, all my iMacs would be dead without it.
Never ever ever drop fan speeds below the speed that the Mac itself is calling for.
MacFansControl…
yellow screen on boot
