Got new RAM, now computer won't boot

[tornadokhm]

I'm using MSI 790FX-GD70 motherboard. I bought the 2 sticks of 4gb DDR3 PC3 17000 G.Skill RipjawsX RAM. Before that I was running 2 sticks of 2gb of OCZ Obsidian Series DDR3 PC3 12800. So when I installed the Ripjaws, my computer booted up just fine. Then I decided to plug my old RAM in the remaining slots and my comouter refused to boot. I then took it back out but nothing has changed. I then tried different positions and combinations, reset my CMOS but my computer wouldn't boot and the motherboard displays the code for Initializing Memory.

So what do you think my problem is and how can I fix it?

 

[nna2]

only if msi had a button to get your ram to boot like asus lol

try putting in the OCZ ram first, i know my 1600MHz ram dosent like getting overclocked much past 1600MHz so thats probaly your issue

 

[gskill support]

Just have one module installed in slot 3, then reset BIOS and see if you can get one module to boot. Basically, you should be able to get one module to boot in one of the slots. Keep us posted on the results.

Thank you
GSKILL SUPPORT