Today, without warning, my computer shut down. After examining the external and internal cables, I came to the conclusion that it was the power supply. I purchased the PSU back in 2015 and it has a 5 year warranty. I really didn't want to wait a week or more to get a replacement, so I went to the local PC store and bought another PSU (Straight Power 11 750 watt Gold from bequiet!). Bequiet! is a German company. Their computer hardware as well as their customer service are really good. My case and CPU cooler are also from bequiet!.
When I get the replacement from the manufacturer, I'll just file it away as a backup.