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Works with one 2 GB module but not with two


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I am upgrading from 2 x 1GB 667MHz modules to 2 x 2GB 800MHz CL5 modules and everything is fine if I insert just one of the 2 GB 800MHz CL5 modules. I've tried them both and they both work fine alone. However, if I insert both at the same time then the hard drive light comes on for a few seconds and then nothing and I have to power the computer down.


I'm running a 64-bit OS and both the original laptop supplier and other tests on the Internet both say that I should be able to run up to 4 GB.


Any ideas? I'm fresh out of ideas and frustrated... :)


Thanks in advance.

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