When i installed 2x4GB my laptop began to restarts when i start Ubuntu it allows me to log in and restarts, in windows after the windows logo disappear it shows up blue screen which says "Your PC ran into a problem and needs to restart. We're just collecting some error info, and then will restart for you.", that appeared and on the second time when i booted windows, the laptop doesn't restarts in the Grub menu or in the BIOS, i started memory test in the BIOS and it passed the test, when i start memtest from the grub menu it also restarts when it go to this stage - https://copy.com/jeuhgJkmfvETbtTK. My old RAM was Samsung 2x2GB and the laptop is HP Pavilion dv7 3150eq, it supports Memory Type: DDR3 PC3-10600, DDR3 PC3-8500, DDR3 (non-ECC), Maximum Memory: 8GB - Slots: 2, Each memory slot can hold DDR3 PC3-10600, DDR3 PC3-8500 with a maximum of 4GB per slot. The ram should be compatible with the mobo. How to fix this restarting problem?