when inserted the SFP module in one port take a look at the output of "show interface gigabitethernetX/Y" watch for a line (I think it is line 5) including the word "media", there should be a short description of the SFP. Also look at the first line of "show interface gigabitethernetX/Y" it could be that the SFP doesn't work in the switch (maybe because it is a none cisco one) then there would be something like "err-disabled". And if you have logging enabled on the switch (e.g. logging buffered 8192 debugging) then there should be an error message also.
The command "show idprom interface gigabitethernetX/Y" shows information about the SFP module in slotX/Y.
Depending on the "err-disable" configuration of the switch ("show err-disable detect" and "show err-disable recovery") a looped interface maybe put in an 'err-disabled' state, see "show interface ..." or "show logging"
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