Theguythatneedshelp :
Anyone else has any opinions on this? It would really help.
I do not see even one reason to believe a PSU failed. Since a computer's power "system" involves many parts. For all I know, the computer's power controller told its PSU to power off for reasons not yet defined.
Two options exist. Either keep replacing good parts until something works (also called shotgunning), Or get a meter, request some instructions, a minute of labor and post the resulting numbers. Only then can the fewer who really know this stuff post something helpful. Currently, others only recoemmend shotgunning. You have now learned what often happens with shotgunning.
Some background. A properly constructed power supply cannot damage the load (ie motherboard) even if it catastrophically fails. And the load cannot damage a power supply. In fact, Intel even says how thick the wire must be to short together all power supply outputs. Even that 'all outputs shorted together' must never damage a power supply - even long before the IBM PC existed. Others who do not even know that are not reliable sources for advise.
Again, the fewer who really know this stuff cannot provide any assistance without numbers from that meter. Your replies will only be as useful as the facts and numbers that you provide. You have not yet tried the second option.
Meanwhile, why do you think the PSU has self destructed? Others may assume that because they only learned the first option - shotgunning.