Hi All, I have an iMac, 2011 version, which suddenly wouldn't boot. Used DiskWarrior to trouble shoot the drive. Results were that the drive was not reparable. Decided to take iMac to Apple store to have drive replaced. They could not do the repair and took the drive to another shop. The report was that the drive had "locked", which they say can happen if computer has not been used for sometime. However, I used the iMac daily, so I'm not sure how the drive would lockup. I have used Macs for many years and have never experienced this issue. Nor have I ever heard of this occurring. Can anybody confirm this condition can occur? Thanks.