We are having a POE issue on some ports on a Cisco SG500-52MP. About 5 users phones are not powering up. We eliminated a cabling issue and a phone issue by plugging in the phones directly to the Cisco switch, however some ports are not powering up the phones. For instance.
Joe's phone is not working and was plugged into port 25
Mary's phone is working and is plugged into port 41
If we swap phones, Mary's phone does not power up on port 25 and Joe's phone powers up on port 41. This tells us something is going on with the switch. We don't want to power cycle the switch just yet as other workstations are working. The system has been up and running for about a year and no changes were made.
Is there something that we can look for on the switch itself to see why those 5 particular ports are not powering up the phones?