Why does my 2009 27" imac keep shutting down?

why does my 2009 27" imac keep shutting down?

Could, also, be failing hard drive , power supply or logic board.
You may have to make an appointment and take your iMac in to Apple or Apple authorized repair center for diagnostics and a repair estimate.
If your iMac has a 1 TB internal hard drive, it maybe a Seagate drive and maybe eligible for free replacement under the Apple Seagate 1 TB internal hard drive replacement program.
If you can get your iMac running, you need to backup all of your data ASAP!. Either backup to optical disc, flash drive/s or purchase an external hard drive for backup. You can use a data cloning program such as CarbonCopyCloner or SuperDuper to make an exact copy of your iMac's internal hard drive.
You can check for eligibility for free hard drive replacement by inputting your iMac's serial number here.
http://www.apple.com/support/imac-harddrive/

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