I've got a stack like this:
On the G's, the link lights are not lighting up when something is connected to them. Also, some of them are solid or constant fast-blinking green lights even though nothing is connected to them.
The devices connected to these problem ports all have connectivity with proper link lights on their NICs, it just isn't displaying the link lights properly on the switch ports.
I've verified that the ports are not in an error state with 'show interfaces status', and that I'm looking at it when it's in the STAT mode.
Also, the problem seems to affect an entire block of 16 ports at once. So, for instance, if port 5 won't light, ports 1-16 won't either. If port 20 works, ports 17-32 work too.
The problem seems to have started when I moved a few Cisco APs that run on PoE from the 3750s to the 3750G's. They were denied power for some reason, and the PoE LED on the front of the switches started blinking amber. I had to move them back to Fast Ethernet ports for them to work.
Has anyone seen this before? Am I missing something obvious?