How do I repair apps crashing, system freeze and Kernel panic?

My MacBook Pro has been freezing, apps crashing, I have been getting kernel panics and it runs hot from time to time.

A couple of weeks ago I checked the Hard Drive and Disc Utility told me it could not be repaired. So I thought (hoped) a new drive would resolve the issues. It did. For about a week. All the symptoms returned. I had to repair the HD yesterday and now again within 24 hours.

Some posts suggest it could be the logic board. Before I go purchase one I want make sure I have covered all my bases. What other suggestions does anyone have for me to check?

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Since you are experiencing kernel panics I would carefully check out your memory and the memory sockets first. Remove all memory and install one at a time trying them in both sockets. Do this with both chips and you should find out if you have a bad stick or defective memory socket.If everything checks out get back to us. As to running hot check your fans for blockages of any kind. Good luck.

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If the memory checks out looking at your other problems you may need to reinstall thermal paste on your heat sink. Lets try the easy first.

MacBook Pro 15" Core 2 Duo Model A1211 Heat Sink Replacement

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Thanks for your replies. I have only one memory chip in the machine. I tried it in the other socket to no avail. From your posts the next things to try would be a new memory stick and replacing the thermal paste? Do you know if thermal paste is available at local stores?

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I downloaded a piece of software called memtest ( http://www.command-tab.com/2008/01/11/ho... ) and ran it in single user mode. My RAM chip failed miserably. Unable to find Mac memory locally I turned to Craigslist where I found compatible RAM for $20. It tested out fine and the machine seems to be running normally again. Thanks for your help. Case closed.

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Al Wadleigh will be eternally grateful.
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