Re: RAM problem
Only thing I can think of, is that the Corsair RAM's speed is beyond what the laptop's board can handle; I'm not sure if this is even possible, but it's plausible. I'd return the RAM, and look for a PC2 6400 speed RAM. Laptop RAM isn't my specialty, so you may wanna wait for others' advice. In a nut-shell, though, you obviously can't use that RAM, so you may as well return it, and look for a matching one that you have, or just buy another Corsair and match them together.
BTW, did you try running the Corsair DIMM on its own?