Now before you link me to some other thread please hear me out. My computer has been working fine for 9 months but I just recently found out my RAM has gone bad unfortunately. During my testing a new issues occurred. I opened up my PC to insert my old RAM sticks to test to see if they were good or bad. I wanted to make sure that the errors memtest+ was showing me were indeed for the RAM I had installed so I went to put in my old RAM just to see if they got errors and if they didn't I would know for sure my other sticks were bad. Here's the problem when I put the old sticks in my PC wouldn't boot to the bios. I put my G skill RAM back in and it still won't boot. Prior to this my PC was running perfectly fine. I had just shut it down to swap the RAM and run a test. Now I'm freaking out cause my Pc won't do anything other then spin fans and light up. My Mobo( an MSI z68) shows no error lights or sounds. Can anyone help me. I should note that I had intels XMP enabled in the Bios while swapping which I think could have caused an issue but I'm not sure I've also tried 3 kits of RAM and no luck. I've also completely removed my GTX680 and used the on board gpu in my i5 2500k and still cannot get to the bios screen. I've made sure every wire was connected and they are. Like I said I've had no issues until removing my current RAM and adding in an older kit( older as in old kit, all kits I tried were DDR3 and compatible with my mobo)