I wanted to increase the RAM on my laptop as it was running very slowly after installing McAfee security. Crucial advised, after a scan, that I could add a 512MB module in an empty slot alongside the 256MB module already installed. However, when I opened up the RAM compartment, there was no vacant slot so I removed the 256MB module and inserted the 512MB module, and this has improved the speed of my computer. In the other slot, there is a '512M DDR 266 SODIMM CL 2.5 card. Can I replace this with a second 512MB RAM module, or is there another slot somewhere else?
Just to keep you in the picture: I came to the conclusion that the second module in the RAM compartment was in fact a 512MB RAM (because of the ambiguous labelling I wasn't absolutely sure), but that it was not working. So I reinstated the original 256 RAM module in its place and, I'm relieved to see, I now have 700-odd MB total RAM. I think perhaps I'll now get a second 512MB RAM from Crucial to top up to the limit of 1GB. Thank you for your help Ashrich!