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Turn it off for 15 minutes and unplug it from the wall as well. It resets this way. Cisco Systems does have a problem with these and the only hope is to disconnect them for awhile to operate correctly again. After they are about 8 months old they tend to do this all the time
Unfortunately the show stack isn't showing any results other than it is either a hardware or software fault. I am guessing it is a fault with the hardware as the show version in your first post states "interface Ethernet-controller 4 failed POST POST error status : general error occured".
Ethernet-controller 4 is one if the gigabit ports (poss fibre port), so if you have anything attached to those, disconnect and reboot the switch and see what happens. If that doesn't work, you could try reinstalling the IOS, but at a guess I would say its a hardware fault.