inspiron 6400 ram upgrade problem

hi, i initially have 2gb of ram and i have heard that it can go up to 4gb. so i went ahead and bought 4 gb(2 * 2gb) after i installed the ram it started acting up. it starts and after 2 second i get blue screen and some msg on it. and it reboots again. i also tried it with my old ram, 1 * 1gb and 1 * 2gb it works for a little bit and then it starts to close down applications like windows explorer and other prorams one by one and then i get the blue screen with that msg.

i have an acer laptop and i installed the two rams on it one by one and they work fine. i have also heard that i might need to uprade the bios but i dont have any idea where to get it.

plz guys help.....

 

http://crucial.com/store/listparts.aspx?model=Inspiron 6400
They say you 6400 (the is a 6400m, but I didn't choose that one) says your board can only take up to 2GB of RAM. To make sure, you can always do a Dell live chat.

 

they do say that i can only upgrade it to onlyup to 2 gbs, but i have read on so many forums where people have changed it to 4gbs. i just dont know what else i need to do.

 

help guys please