I have a C640 Dell Latitude laptop, and it has double 256MB RAM modules, so my laptop should normally has 512MB RAM memory.
Sometimes laptop boots fine with 512MB, but usually it boots only with one module and then I got the message "The amount of system memory has changed".
I run on it Windows XP and Ubuntu, both of them shows
256MB or 512MB RAM memory. I checked at BIOS too, same.
I thought that its not inserted well second RAM module in slot, and I opened my laptop, checked the modules, all was fine. But the problem its still there. Does anybody know why this laptop does not boot always with both RAM modules, and how to fix it?
Thanks in advance.