Normally that would be graphics as it looks identical to a dead GPU. However you have the 13" model and it's very unlikely for the iGPU to fail.
As you recently upgraded your RAM, I'd say that's causing the issue, especially because VRAM is shared with the RAM. What model/year MacBook do you have? The 2011 can only take 1333MHz and the 2012 takes 1600MHz.
Additionally, please can you also confirm what RAM you installed in it (if you have a link to what you bought?)