If the warning message is to be believed, it's coming from either your computer's BIOS or a third party app you're using to monitor such things and is informing you that your power supply is outputting too much voltage on the +5 volt line. That could potentially damage components which is why it's popping up the warning.
Swapping out the power supply will likely be required even if only to remove it as a possible cause of the problem.
_________________________________________________________ I'm available in the forums Monday - Friday, 12 pm - 8 pm Pacific Time Please provide feedback! - https://www.surveymonkey.com/s/Omrakos