Hi, So I've been trawling the web for hours looking to a solution to this problem but can't fix it so please help if you can. When I turn on my 2007 MacBook the grey screen runs fine. When it comes to the blue "Starting Mac OS X" screen, the blue progress bar fills but then stays like this and won't go any further. I've left it like this for over an hour and it stays the same. The measures I have taken so far are: - Repair Disk & Verify Disk in Disk Utility - Ran fsck thing in Single-User mode, no problems detected - Repaired Disk Permissions - Pressed cmd/alt/p/r to reset RAM on startup I know my Harddrive is detected so I don't know what the problem could be, any help would be greatly appreciated.