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An old laptop I bought (IBM ThinkPad T30) has two memory slots but only one seems to work. When I run a memory test it seems to suggest nothing is wrong. If I put a memory module in the other slot on its own it won't work and the system beeps.

The first slot works perfectly yet I have both slots filled with 512MB and the maximum load is 1024MB.

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You'll probably get more help on superuser.stackexchange.com. –  Maxpm May 2 '11 at 17:15
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migrated from stackoverflow.com May 2 '11 at 17:16

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2 Answers

It sounds like the motherboard is defective.

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Have you tested both SODIMMs in both slots? Are both chips identical?

Have you used the IBM diagnostic or something else?

Any sign of damage on the socket?

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