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We can try some basic troubleshooting steps and see if it works or not. First try Disk Utility.
If that didn't work, then reset the PRAM and NVRAM and also try to restart in Safe Mode.
Reset PRAM and NVRAM
Restart in Safe mode Make sure that the computer is shut down. Press the power button. Immediately after you hear the startup tone, press and hold the Shift key. Release the Shift key when you see the gray Apple and progress indicator. Let the Mac boot up...
Let me know if that didn't work, so we continue troubleshooting. Don't Rate my answer until you are satisfied.
What is "Hold down option at boot"?
I don´t know which key that is?
Same thing happens - gray screen with logo and circle
Tried option two, and have screen OS X-utility. Four options; recover from time-machine back-up, Install OS X again, Get online help and Disk utility. Whick alternative du You recommend?
Started with "verify disk". Scanning complete: Volume Macintosh HD appear to be OK. Have not yet used "Repair disk". What now?
Used repair disk. In a second the green bar flew up. No question with repair permission. Restart and again gray screen with logo and circle.
Started with reinstalling OS X. 4 minutes left.
It was 4 hours, not minutes
I´ll do so! Do You think problem is solved? OS X is downloading so wifi is working. Wifi not working yesterday was the reason for restarting mac and the start of the problem.
Problem solved! Thank You very much. It was my daughters Mac and she had an assignment on the Mac that she has to deliver tomorrow. Worked out nicely
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