Hi!
Okay, what did you tried so far??
What I would do, is testing the power supply and see if it's still can give you the correct voltage. The contacts should give 12V continuously (even in stand-by mode).
If this fails, then replace it for a new one and see if that works.
Guide: [guide|141729|PlayStation 5 Power Supply Replacement - iFixit Repair Guide|new_window=true]
Please let us know how it goes!