My computer will not start up but the PSU makes a buzzing sound. I have already tried the paper clip trick and the PSU turned. Im thinking it may be the connector because i cant get the 24 pin in all the way,but it worked fine before.
What kind of hardware are you running off of it? Also, Is it a buzzing, or a higher pitched screeching? Buzzing is caused by transistors which is fine and normal, screeching means one of your caps is blown which means end of life for the unit.