All of a sudden I keep getting message that my computer must be restarted and it freezes. I restart it and within minutes it happens again. This is a 27 inch iMac with latest system and software

All of a sudden I keep getting message that my computer must be restarted and it freezes. I restart it and within minutes it happens again. This is a 27 inch iMac with latest system and software. Any ideas of what is wrong and how to fix it?

10.7.5 is not the latest system, 10.8.3 is. However your message sounds like  a Kernel Panic, does the message look similar to About "You need to restart your computer" (kernel panic) messages? If so, then if you can get the machine to restart normally then please post the Kernel Panic Report which you can find by following directions in How to log a kernel panic. Please post back with the KP log, and we can take a look. However if the machine continues to not restart then my guess is a hardware failure suck as a hard disk or failed RAM in which case you should take it into your local Apple Store or AASP for repair.

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