IMac running Lion sometimes does Repeat Beep and freezes crashes

Longtime Mac user. Upgraded to Lion when released. Worked fine for days till three days ago.
About twice a day (computer is on all day in office - iMac), it has started a loud beeping, long beeps, several at a time and then a pause, then more beeps, and all the whilte the cursor FREZES on screen. Keyboard input is ignored. Nothing changes on the screen but it must be shut down with the Power Switch, no other way works.
Lion? or what?
Never saw this before.
Not happening on my MacBook Pro 17" running Lion
David

There's a kb article here about beeps, but it refers to power on beeps:
http://support.apple.com/kb/ht1547
Doesn't sound as if your machine is very healthy - I'd advise backing it up as soon as possible
Do you have Apple Care? Can you take it to a Genius Bar for inspection?
Regards,
Colin R.

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IMac running Lion sometimes does Repeat Beep and freezes crashes

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