Laptop hang up

My thinkpad T42 hangs up after 1min after starting.I consulted a technician and he told me thati need to change my mother board.Where can i purchse motherboard.I purchased it for $1500 from IBM.How much the motherboard costs?Please help me.
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  1. Replacing the mobo is not too difficult. Several sites are available for the parts needed. Googling "thinkpad t42 system board" will provide everal sources.

    Here is one such site:

    What you are describing sounds like a heat or power problem. Have you used a can of compressed air to blow the dust out of the input and output fan ports?
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