CPU light on motherboard displaying after installing ram.

So my computers been working fine fore year, and I decided to install 2 new ram sticks. I plugged the ram in, but I think one was seeded properly turned my pc on and got a red cpu light and a blinking dram light on my motherboard, and it did not boot. I took out the newly installed ram sticks and turned my pc on and now I only have the cpu light, it still won't boot. Does anyone know what is wrong and how to troubleshoot it?

Update: I had 2 open slots, I used the exact same sticks for the new slot.