Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A405 Safari/7534.48.3) Hi guys. Until yesterday all was fine but today my Mac is not booting. I turn it on, get the Apple logo then the spinning circle beneath it and nothing else happens, it just stays there. I've ran recovery HD and performerd a disk and permission check and all was absolutely OK. Any suggestions on what it might be? I have a late 2008 MacBook alum. with 4GB of RAM and a 3 months old Momentus XT hard drive.