My screen freezes up more often and the keyboard shortcuts don't work. I have to manually shut it down. what can I do about it?

My screen freezes up more often and the keyboard shortcuts don't work. I have to manually shut it down. What can I do about it? It's a pain when I'm in teh middle of doing something or chatting in MSN Messenger.

The problem is no Frre Ram. (green slice), Use Disk utility to REpair Permissins & see if the Ble turms to green.
At the Apple Icon at top left>About this Mac.
Then click on More Info>Hardware and report this upto but not including the Serial#...
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 6 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.21f4

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