So I bought new ram and put them in and they were different speeds than the old ones and now Im starting up with the old ones and there's no display. I've checked the placement of ram stick, I took out the GPU and put it back in, the monitor still says ' no input signal' but each time that I put the cable into the port, the monitor starts up like it's going to show picture but it just gives up. The monitor is ok, I don't know what I'm doing wrong.