He obviously got a good one then although 5 years is a long time it could be an issue now of the electronics actually wearing out I would clean it out check all components for any sign of damage or wear with a thorough 10minute look into every nook and cranny and then use it
No they used to be so you weren't wrong. I forget who they have switched their OEM to now but as you stated they used to be OEM FSP which is why they were decent PSU's for the most part. I'm not to sure how they are now but Sparkle used to be pretty good units.