My 2007 iMac (lion) starts, logo appears, status bar shows up, takes 2 mins to finish, then shuts off

My 2007 iMac (lion) starts, logo appears, status bar shows up, takes 2 mins to finish, then shuts off. Please help!

This sounds like a hard drive issue. First I would try to boot to safe mode: OS X: What is Safe Boot, Safe Mode? - Apple Support
If that works do a backup ASAP with Time Machine: Mac Basics: Time Machine backs up your Mac - Apple Support or copy your important files to an external drive if they are not already backed up. If that does not work, Boot to recovery:  OS X: About OS X Recovery - Apple Support
The next step would be verifying and if needed repairing the hard drive using Disk Utility.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support
If it successfully repairs, do a restart and see if it boots as normal. If it cannot be repaired, it means that the hard drive has failed/is failing. If you do not have the data backed up you could try getting the data using target disk mode: OS X Mountain Lion: Transfer files between two computers using target disk mode ,booting from an external drive that has OS X installed on it: OS X: Installing OS X on an external volume - Apple Support, or 3rd party data recovery service.
After data is backed up or recovered, you would need to do an erase and install of OS X: OS X: How to erase and install - Apple Support
If it fails to erase, then the hard drive needs to be replaced.

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