I have tried to upgrade my system but I am getting frustrated. So I bought a Gigabyte GA-78LMT-USB3 R2 motherboard and paired it with a AMD FX 8350 CPU with 8GB DDR3 Offtek memory. When I connect everything all I get is a blank screen. The PC powers up and power is definitely running. The CPU fan spins and I am using a 800W PSU. Please help.