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crwdns2934241:0crwdne2934241:0 rj713

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Here is a link to Apples test procedures. In particular I would like you to run disk repair. For the memory problem only being able to use one stick is a common problem but you can try cleaning to socket with alcohol. Make sure the unit is unplugged and the battery removed first.

I hope these measures help you.

http://support.apple.com/kb/ts1417

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open