Yeah that's what I thought it was too. So I took a copper wire and tried jumping the PSU to see if it works, and indeed it did. The PSU is definitely supplying power since a green light on the motherboard is on. I ended up taking it to the computer store real quick to have him double check for me to see. First he plugged it in and verified that the PSU was indeed dead. Then he tried a different power chord, and this time it worked. THEN he went back to the original power chord and it also worked. Weird.
So I take it home and plug everything back in and this time everything comes on. I can hear the HDD running, the CPU fan is spinning, and lights are on. Makes me think it's not the PSU now. Now the issue is that there's no display. Which is actually the same problem that I had awhile ago with this same computer. Everything turned on but the monitor never recognized the signal. I found out that it was a bent CPU pin. That can't be the case this time because I just replaced the CPU today, so the CPU is fine. This theory leads me to believe that it must be something wrong with the motherboard socket, because I bent the pin on the CPU by seating it wrong on the mobo and pushing too hard. So NOW I'm starting to think that I must've fucked something up in the motherboard socket when I put the original CPU in wrong, considering that it's displaying the same exact issues, as before, but with a working CPU.
Makes sense right?
EDIT: Oh almost forgot. The motherboard has a green light telling me that it's getting power, but it also had a red light on the bottom, indicating who knows what. I remember seeing that light before when I had CPU issues. Now I have no idea.