Hi all, I've googled this, and there seems to be a few reasons for this. But just wondering if anyone might be able to clear up whether my situation is resolvable. So, I (seemingly stupidly) inserted a windows CD into my MacBook Pro in an attempt to fix my windows partition (I forgot I should use bootcamp assistant!). The CD loaded to the welcome screen of the Windows installer. I turned off the MacBook by holding down the power key, and turned it on using the shortcut to eject the Windows CD. When I tried to turn the MacBook on again to load up Mac OS, I was greeted with a flashing folder icon with a question mark on it. I have tried booting the laptop holding down the option key and: - Performed 'Repair disk' on 'Macintosh HD' - It completes and gives me the message 'The volume Macintosh HD appears to be OK'. It then says, 'Updating boot support partitions for the volume is required.' (Any idea how I do this?) - I also tried performing repair disk on the BOOTCAMP partition. It doesn't give me a success message per say, but does say 'Volume repair complete'. - When I try and perform disk repair on the 'Toshiba media' it says 'Storage system repair or verify failed' - I also seem to have a greyed out disk0s3 partition that when I try and repair disk in it says, 'Disk utility can't repair this disk.' I don't particularly care about the Bootcamp or disk0s3 partitions, but if anyone has any advice on if it's possible to get the Mac OS working again, that would be much appreciated! Thanks in advance for any help, and I apologise if this has been posted in the wrong forum!