HT202796: How to install OS X on an external drive connected to your Mac
Learn about How to install OS X on an external drive connected to your Mac
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Helpful answers
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Jan 16, 2014 2:38 AM in response to rudinorwayby Paul_31,What OS was on the Mac when new? If it was Lion (10.7) or later Internet Recovery should put that OS back on the Mac. Whilst connected to the internet (wired would probably be better than wifi as it is a big download) reboot hold Command+Alt (Option)+r - more info here:
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Jan 16, 2014 9:54 AM in response to Paul_31by rudinorway,Thanks
But can't put OS back on Mac because I only have my new apple ID and I dont have my old apple ID which is the one I need.
I sent the Mac to a apple service shop today and they fixed the problem by installing a new Lion OS X
it cost me 73 Euros
anyway got the problem solved to a expensive price, but can live with that:)