Cisco 2921 seeing HWIC but doesn't seem to have power?

[gherkin12]

Hi all

Quick question, i have a 2921 with a 8 port EHWIC module and a 9 port HWIC module.  The 8 port works fine, the 9 port works fine (when it was in the 8 ports location slot).  I've move the 9 port to subslot 3 (from 1 where the 8 port is located).  If i run show inventory (see below) its seen no problem, however if i use the command show ip int all it shows are the 8 port interfaces (plus the vlans etc etc) but not the 9 port.

Do i have to run a command to activate it at all or is it something else?

I hope the above makes sense, apologies if it doesn't

TIA

NAME: "CISCO2921/K9 chassis", DESCR: "CISCO2921/K9 chassis"
PID: CISCO2921/K9 , VID: V06 , SN: FCZ160870Q4

NAME: "8 Port GE POE EHWIC Switch on Slot 0 SubSlot 1", DESCR: "8 Port GE POE EHWIC Switch"
PID: EHWIC-D-8ESG-P , VID: V01 , SN: FOC174722XP

NAME: "9 Port FE Switch on Slot 0 SubSlot 3", DESCR: "9 Port FE Switch"
PID: HWIC-D-9ESW , VID: V01 , SN: FOC14492FHJ

NAME: "C2921/C2951 AC-POE Power Supply", DESCR: "C2921/C2951 AC-POE Power Supply"
PID: PWR-2921-51-POE , VID: V03 , SN: QCS1645F05E

[Leo Laohoo]

I do not believe it is meant to work i Slot 3.  

The router can only support 2 of these switch cards.  Even though there are a total of 2 switch cards, they are always enabled in the first two slots.  

[gherkin12]

So on the rear of the 2921 there are 4 slots, 2 along the top for modules like HWIC cards and then 2 along the bottom for service modules.