What can I do to fix my iMac? When I start it up, it just loads forever (never getting to the Desktop). The mouse will appear then disappear, then the loading bar will sometimes appear and then disappear and it just goes in circles forever. If I start up in safe mode (by holding shift), it gets to the login window. However, if I attempt to log in the login window disappears and reappears asking for my password again.
What can I do to troubleshoot this?