Resolved Start up disk Mac/Windows

[gian8989]

It has been a month since my iMac decided that the startup disk should be windows. In setting the main disk is still MacOS (I still have Sierra 10.12.6) but at the start up it always goes into windows.
Even inside windows when you select in the bootcamp icon at the bottom reboot in Mac, it just reboots in windows.
Any idea why it happens? Right know I am forced to always press option at login to manually select MacOS.

 

[barbu]

I'd do the old "zap the pram" trick to see if you can't clear out that setting. With the Mac powered off, press power, wait for the bong, then press and hold Cmd-Opt-P-R until it reboots, then release. See if that helps.

 

[gian8989]

I'd do the old "zap the pram" trick to see if you can't clear out that setting. With the Mac powered off, press power, wait for the bong, then press and hold Cmd-Opt-P-R until it reboots, then release. See if that helps.

Thank you. It worked. No idea why i didn't think about it.
It was probably do to the AMD drivers update in the windows partition.

 

[barbu]

great news! I'm glad it worked.