New motherboard dead on arrival?

There's no beep sound when I start it up. I don't even get to BIOS, I just get black screen (I did get to Windows on like 1 out of 15 tries). I tried doing only CPU, PSU, motherboard, and still black screen/no beep. What to do? The CPU is old but I don't think it's the problem... I know the PSU works for sure. It doesn't continuously reset on its own (like my old broken mobo). It resets by itself once and then it stays on.