I don't have any Cisco devices but I tho that this problem might be similar to all ethernet switches.
I have a Planet FGSW-2620S 24-port gigabit ethernet switch. I haven't configured it at all (with anything), reseted it many times. After reseting it long time ago it worked quite well (except few randomly not working ports). I have 3 RJ45 cables (2 workstations, and 1 that goes to my router). I can't get even those work. See I think they have a connection for the first few seconds and then every connection gets disconnected. Weird. Sometimes some combination of ports works... but not for long. Is there anything I can do - can any1 give me a hint?
Thanks for reading my problem Saku