Ok so I put new power supply in and my PC is not turning on now...
I took special care in not touching anything I shouldnt have....I checked several outlets in my house still nothing. I made sure power supply was turned on in back of machine obviously. The only cord that was a little funny when I hooked it up was on the motherboard there is a 4 square plug and on the power supply cords the smallest was a 6 square plug as the smallest.
All the other cords clicked right into for harddrive, cd rom, and video card?
That 4 pin needs to be plugged into the mother board. You have your main mobo power (the largest plug) sata power and molex for hardrives and cd roms,things like that. 6/8/6+2 pin for video cards, and 4 pin for the cpu.