HELP is urgent about ram

PandaKun1205

Prominent
Feb 16, 2017
41
0
530
I jusy buy a DDR3 4gb ram
My motherboard is P55UDR3
I now have 2x 2 gb ram in my pc now
I tried to put the 4gb on a slot (I have 4 slot)
And also tried 2+4gb ram dual channel
My windows won't start It just stuck at starting windows
I using windows 7