Thank you Royan, just shows you do have to be logical with computers:emotion-3:

Turns out the computer doesn't like one of the two sodimms any more.

With that chip in either slot I get the error, but the other one works fine.

Can I ask a quick supplementary?

The good SODIMM Is 512Mb what is the max. memory for this model and do the do modules have to be the same size?

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Thanks again

David

Thanks for the quick reply Royan, I have tried that but will give it another go and report back.

Hi,

The Inspiron 6400 system supports dual-channel DDR2 SDRAM with speeds of 533 and 667 Mhz. The maximum memory supported by this system is 2 GB, so each slot will hold 1 GB of RAM. Memory modules must be installed as a perfectly matched pair to take advantage of the dual-channel memory bus. If not a matched pair, the system's memory bus operates in a single-channel configuration.

Thank you

Royan

You can put 4GB in your 6400/E1505 but it will only see 3.25 available for use even with a 64 bit operating system.