iMac corrupted hard drive is creating problem as you are unable to access the saved data and your system is not even booting. The iMac is the desktop version of the Apple computer that are mostly used in home or office and then can be many causes for the hard drive corruption. When the iMac closes abruptly because of the power outage, the partition process of the drive was incomplete or stopped due to some error. iMac corrupted hard drive can occur due to virus infection, bad sectors in the drive etc. You can use the disk utility to resolve the corruption issue, the tool is able to fix only minor problems but to fix the major corruption you need to format the drive. The formatting will fix imac corrupted hard drive but the stored data will be erased. You can recover the files from the time machine backup but if it fails then you can use the Mac data recovery software which is very well compatible with the iMac. You can run the scan of the drive and you will get the list of files that were deleted and you can restore them easily. So download the and use the software now.