Modular PSU have a lot of connection, make sure it was connected from your PSU to your component.Other end?
Check your CPU connector, there's maybe some dust that make it wont connect.I did the paperclip test and the PSU turned on, but when I connected it to my computer the CPU EZDebug would flash. Maybe something is wrong with the CPU connector.
No, unless if your PSU cable has a cheap build quality.Could I be because I twisted the 24 pin cables?