So, I recently bought a Corsair CX600M PSU. I bought this one on purpose, because it's good one and it's the same size as my previous PSU, so I can be sure that it'll fit. Surprisingly, the screw holes don't align at all. I can only use one. No matter how many times I tried, it's no good. Shall I try to give it back to the store or is there any other way to fix this?