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I have tried restarting holding the Apple key and R - Nothing. I have also tried holding the ALT key on bootup but it just gives me an arrow curser and nothing else.

I am not sure if the hard...

I had this issue today morning while installing 10.10.3 and this is was I did.

1) I forced shut down the mac by pressing and holding the power button.
2) I booted the machine in recovery mode....