Thank you Linc Davis !
Before you told me this I couldn't start up at all - I tried 3 times and it didn't work so I started disconecting my external harddrive - That did help. My next step : I removed my 2 internal haddisks .
Then I read about NVRAM resetting and I did that aswell , though it took a while to figure out where the option key was. It does not say 'option' on my keyboard so I looked it up and I was glad I was not the only one not knowing this - there is speciel symbol on my keyboard instead of the text 'option' ...
So far so good - My next question what do you think about the msg from diskrepair saying :
WARNING: SUID-arkiv “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent” has been changed and can't be repaired
I have never seen this before and can't get anything out of it?
It seems to work for now - I think I have to decrease the 2 other internal drives.
Thank you again !!!
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repaired successfully" at the end of the output. Then reboot as usual.
I never got the "Permissions repaired successfully" . It's a brand new 1 TB hardrive I guess I will return it.