I had this issue after trying to install Bootcamp, silly me should have just stuck to VMWare Fusion like normal people.

Anyway, most people say hold the option key, but you may find that that doesn’t work because you have not even got as far as the post beeps (C major chord for all you geeks)

Anyway what you need to do, is if you have disk stuck in you can eject this by holding down the mouse button and restarting after 10-20 seconds it will eject, job 1 done.

Next you need to reset the PRAM settings, which is done by holding down a 4 key combination:

Cmd (ALT) + Option key + P + R

this will then post with the C Major chord and then you can let go and it will boot into MAC OSX, then once in just double check that the Mac is your main start up disk to stop this happening again

that is in setting > startup disk

not that it matters but i did all this on a Macbook Pro running OSX Lion (issue came after trying to install BootCamp)

Hope this helps,

thanks for reading

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