How old a Mac is it? More modern Macs allow you to do from Apple' servers. Okay takes a bit of time but you could get into disk utility on the Mac then... I'm assuming it's not newish because you've not been given the option.
If this is an older Mac, does it have a DVD drive? If yes, then do you have access to a OSX installation DVD?
Last edited by: rtj70 on Mon 11 Jan 16 at 17:48
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