My bro just got a sweet deal on this Compaq laptop, and is trying to add ram. Compaq, Crucial, PNY, and Mushkin all state that this model will support up to 320MB. When he adds a 256MB module, it only recognizes 192MB, seemingly subtracting the 64MB of onboard Ram. We've tried 2 different modules from two different manufacturers, with the same result each time. Any ideas?