Agree that the two sticks don't appear to get
on with each other. You may have success slowing down memory timings
in the BIOS if you can - laptops are notorious for having a crippled
BIOS that doesn't allow much in the way of tweaking !!

If that isn't an option then the only way to get 2Gb working would be
to purchase a matched pair of 1Gb sticks - is it worth it when 1Gb is
probably going to be ample for most situations ?