I have a one year old imac with three accounts set up on it. Suddenly yesterday my main account (the administrator) allows me to enter an ID and password but after a few seconds, comes back to the account login screen. I can log in via either of my kids' accounts but I can't get in through my account. Unfortunately, all of my photos and music are set up under my account. I had just downloaded the latest updates to OS X without a problem prior to this happening. Any ideas? I haven't installed any software in the last six months other than what is provided in the automatic mac updates. I really don't want to reinstall the OS. I've rebooted several times but have had no luck over the last two days. Any ideas? Thanks.