After installing 8gb RAM 2x4 on my Intel H55 Motherboard, windows wont boot, i get this screen, and the keyboard doesnt work, the only difference between old memory sticks and new is
RAM Single Channel vs. Dual Channel | 1x8 or 2x4? - YouTube
Kingston Technology 8GB Kit (2x4 GB Modules) 1333MHz DDR3 SODIMM Notebook Memory for Select Apple iMac's and Macbook Pro's KTA-MB1333K2/8G at Amazon.com