~2010 iMac doesn't boot

My iMac doesn't boot up.  I get a boot tone, apple logo, spinning gear, and progress bar across the bottom.  After the progress bar completes (usually 5 - 8 mins), then I just have the apple logo and spinning gear.  Tried unplugging for a few minutes; same problem.  Tried safe mode boot up (read that in the community somewhere); same problem.
This is my wife's computer so I'm not sure what OS version she is running. Can anyone help

This is my wife's computer so I'm not sure what OS version she is running.
Ask her.  It's very hard to provide troubleshooting suggestions when we do not know which OS is installed.  The wrong suggestions can damage your system.  If your wife has AppleCare, call them.  Let them deal w/the problem.
Try the following basic solution: 
http://support.apple.com/kb/TS2570 Mac OS X: Gray screen appears during startup

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