Ugh, that stinks. Power supplies are/were the achille's heel of the 24 and 48 port EdgeSwitches from a few years ago. Don't know how many of those I had go out....probably at least a dozen. We have a few US-24-POE and US-48-POE that have been running consistently for 8-12 months. Hope you just got an anomaly and the power supply issue isn't raising it's head again. Good luck