So i'm building my first pc and i have my mobo on the box to test everything. i installed the cpu, stock cpu cooler, ram, and plugged in the 24 pin power connector. i powered it up and it didn't run cause i forgot the 8 pin. i plugged the 8 pin in and when i press the power the psu makes a loud ticking noise, the fan doesn't run and i have to flip the switch on the psu to turn it off. any ideas?