My home imac has crashed and will not boot up.

Hi
My home imac has crashed and will not boot up and I'm not sure where to start.
It wouldn't shut down properly so I turned off the power, and now it won't go beyond the apple logo and timeer when I try to restart it.
It is an imac (4 years old), Intel, running OS X, not sure which version, but probably the latest.
Thanks
Carol

I would first reset the SMC:
Shut down and unplug the Mac.
Keep the Mac unplugged for at least fifteen seconds.
Plug the Mac back in and do not turn it back on for at least five seconds.
Press the power button to turn the Mac back on.
Then I would reset the PRAM by rebooting the iMac while simultaneously holding the Command-Option-P-R keys until the machine restarts a second time.
Let us know if these two procedures don't solve the problems.
Hope this helps

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