My computer has had MANY bluescreen problems, and it has also restarted itself or frozen randomly. I bought new RAM, but everything else in the PC is around 4 years old. I tested each stick alone for 1hour 30minutes and there were no errors. When I woke up today after testing both sticks together for 12 hours it came up with 4 errors on test 5. Does this really mean I need to return the ram fresh out of the package, or could it be another part of the PC that gives problems? The RAM is the G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory. Thanks for any insight you guys can bring. I should also say I don't know a lot about memtest, so I just ran all the default stuff. I just know that more than 1 error means you should return.