Sounds like IDSM2 rom issue, or switch IOS that does not recognise it. Sometime this is also happened to Firewall module (FWSM).
Do a 'show hw-module all fpd' and/or 'sh module'. Check the IDSM2 power status at the end of the line. Is the Status 'PwrDown'?
Check the IDSM-2 and switch version compatibility matrix. Issue 'sh version' on the switch, and check the IDSM-2 version (session into IDSM-2).
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/csids/idsm/idsm_2/13074_04.htm#wp333372
HTH. Pls rate all useful post(s)
AK