So, I am having some difficulty. The PSU for the computer had been really loud as of late and we were worried that it might break. So, we replaced it. I received the new PSU today, took out the old one. (had a little trouble removing the connector near the CPU). Placed the new one in connected everything. Tried powering on and got nothing. there was a slight burning smell. Put in the old PSU back in fearing it was DOA. Turned the power on. Nothing again, slight burning smell returned. I think I might have fried something. Is there a way for me to diagnosis this past I think I might have fried the motherboard?