Barns Posted August 28, 2009 Share Posted August 28, 2009 Hello, 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. Link to comment Share on other sites More sharing options...
Yellowbeard Posted August 28, 2009 Share Posted August 28, 2009 Are the 2 x 2GB modules made by Corsair or by another company? Link to comment Share on other sites More sharing options...
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