My laptop is HP Pavillion dv4-2126tx. It came with a 2GB RAM(DDR3). It runs Win7 Ultimate 32bit.
I know that my OS supports only upto 4GB. So i fitted a single 4GB(DDR3) ram in socket#1. But my PC dint startup and showed MEMORY_MANAGEMENT BSOD. Then i tried fitting the old 2GB stick additionally in socket#2 along with the new 4GB stick in socket#1. Now, PC starts showing 6GB memory of which 2.93GB usable, which is good. But I want to know why Im unable to run with only the 4GB stick installed.
More about :4gb ram recognized untill 2gb ram added
Its an old pavilion. Maybe it only is compatible with 2 gb ram sticks.
But the manufacturer states that my PC can handle upto 8GB RAM(there are only 2 sockets) hence it must accept atleast 4GB RAM... And also the 4GB is working along with the combination of 2GB. But not working if installed solo.