My pc was has been working just fine until yesterday when I couldn't turn it on. The fans (including the psu fan) would start spinning for a split second and stop right afterwards.
So then I took out all the hard drives and plugged them into my second pc. They are all working fine.
Then I took out the power supply and tested it using the paper clip methord. The psu fan turned on and continued spinning until I turned it off. I also checked the voltages with a digital multimeter and everything seemed fine.
Then I plugged the PSU back into the PC and the same thing happened as yesterday.
Then I unplugged the PSU and tested it with a paper clip and digital multimeter again and everything worked just fine.
So at this point I don't even know what to do.