Freeze on logout Mac 10.6.8

I have a couple of users on my compute and all of a sudden when someone tries to logout the screen goes bloe and I get the spinning thing - I have left it for hours. I have done Techtool Pro and Drive Genius - Help. I have to hold power bitton to **** down and restart every time.

Hmm, interesting, I found out recently that my old G5 if put to sleep with Mail running will often crash or not wake, quitting Mail it seems to always wake!

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    http://discussions.apple.com/message.jspa?messageID=13240047#13240047
    https://discussions.apple.com/message/15223603#15223603
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    https://discussions.apple.com/message/15613068#15613068
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    http://lowendmac.com/ppc/power-macintosh-g5.html
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    http://eshop.macsales.com/item/Newer%20Technology/CR2032/ 
    http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/ 
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    Hello John
    Like tjk said....replacing a logic board could be expensive.....according to a wikipedia article "Laptop computers generally use highly integrated, miniaturized, and customized motherboards(which is a logic board). This is one of the reasons that laptop computers are difficult to upgrade and expensive to repair. Often the failure of one laptop component requires the replacement of the entire motherboard, which is usually more expensive than a desktop motherboard due to the large number of integrated components.
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