Imac doesn't turn on and make a panic type sound

I Installed OS X Mountain Lion yesterday and today I applied the updates suggested. After a few hours of work it began to turn off. I restarted several times and sended the problem report to Apple. The last time that I had the problem I was unable to turn on the iMAC and I get a panic type sound. I repeated the operation with the same results.
Please, I appreciate any help.
Regards,
Renzo

Thanks for your help.
I check the Disk as suggested and found a problem that repaired with Recovery HD. Thanks for that.
After 2 hours I turned on the machine with no problems.
Then after another 3 hours or so the machine shut down. When I try to power on I get the 3 beeps again.
Wait an hour or so and started OK but I think that it could be some sort of overheated component.
Thanks for your help.
Regards,
Renzo

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