I have a old ram which is 4gb mhz 1600 and i bought a new one to updgrade wgich is 4 gb ram also and 1600 mhz but different brand but as i open my computer after putting the two it stops at the startting windows and some message pop up that their are changes. As i also try only the new ram it passes the windows starting after that it gives me blue screen error. Please help im new to this specifically to the voltage or dram somethin