We have a Catalyst 3560G-48 POE that had some POE problems. The switch had been in service, with no problems, for at least the past 6 months with only one POE device running off it, an AIR-AP1242AG-A-KP on port 48. We are in the process of implementing Cisco VoIP and went to this switch to test vlan trunking for voice-vlan. Attempting to plug in a 7975 phone directly into switch, the phones did not even try to power up. We tried several different ports with the same result. We also tried a couple of different models of cisco phones (7961 and 7970) with neither powering up. The phones did not power up at all. Investigating the switch and looking at the show power inline, the switch was reporting 5 or 6 ports having 15w of power in use even though there was only one POE device (wireless AP on port 48) plugged into the switch. It seemed to correspond to the switch ports we had tried plugging the phones in to. The ports were also inactive (nothing plugged into those ports) and still showing 15w of power being used. At this time, the POE wireless AP on port 48 was still working ok. We built up an identical switch and took it out to site and that switch is behaving fine. Got the problem switch back to office for testing and the switch seems to be delivering POE ok. I have tested plugging in 6 or 7 POE phones (7961, 7970, & 7975) to the problem switch and they all power right up and work ok. I am just curious if anyone has seen this type of POE issue with a 3560G-48 POE. We have many of these out in the field and this is the first time we have come across this issue. Could it have just needed a reboot? We are concerned about putting back out in to the field since it had this problem. Could there be something wrong with the POE on this switch? It just seems the switch ports were kind of delivering POE but not enough to power the devices up. What types of tests can we perform to thoroughly test POE on this switch? Or should I contact Cisco support for possible warranty replacement?