Reboot Loop when RAM is in DIMM slot 2. Help!

I just bought 2 4gig G-skill snipper Ram for my computer. When i went to turn the computer on after putting the RAM in the computer started up then within 10 seconds of everything turning on it would shut off and then turn it's self on again and reapeat this. It never shows anything on the screens. They are just black all the time. I took out the new ram and put them into the DIMM slot 1 where my old ram was and it turned on fine. Then i took my old RAM that i knew was working and put it just in the DIMM slot 2 and it caused the reboot loop. Has anyone have any idea what this might be.

Mother Board: MSI P67A-GD65 (MS-7681)

CPU: Intel Core i5 2500

New RAM: G-Skill Sniper DDR-1600 PC3-12800 4Gbx2

Old RAM: G-Skill DDR3 PC3-10666

Power Supply: Corsair CMPSU-650TX 650W

Video Card: Radeon HD 5770 Sapphire

Thank you for your help.

You need to match the color memory slots..i.e. blue and blue...black and black. Check manual. Most lightly l stick in slot one and one stick in slot 3.

Sorry for my confusion. What i ment by Dimm slot 1 and 2 were the pairs.:PWhat i should have said was when i put RAM in DIMM Slot 2 and 4. I had my old ram in slots 1 and 3 and then i put my new RAM in slors 2 and 4 and thats when the loop started. I tested both pairs of ram in slots 1 and 3 and it works fine. I put both pairs of ram in slots 2 and 4 and it doesn't work. I also tried puting the RAM in slots 1 and 3 and then booting it up once with a 3rd piece of ram in just slot 2 and once again with the 3rd piece in slot 4. All causing a loop. I don't know if these some type of power or something seting in the BIOs that i need to enable for the 2 and 4 slots to work but most of the articles I read about this problem either doesn't relate or doesn't work. But Thank you for your time and trying to help. I'll let you know when I figgure it out and if you have any more helpfull ideas i would love to know. Thank you:D