While not definitive, these can signal PSU issues:
The most reliable method to check a PC power supply is – especially for intermittent problems. For a quick check, combine the paperclip test (power on) with multimeter voltage verification. Never rely solely on BIOS readings or the paperclip test for pass/fail judgement, as PSUs often fail under load while appearing fine at idle. how to check power supply on pc
Must read close to +5V (Safe range: 4.75V to 5.25V). While not definitive, these can signal PSU issues: