On a GDC SX or SA series server (SX-2000, SX-2100, SX-3000, SX-4000) the information button (i) is replaced with an X.  This is a warning recently implemented in a software upgrade and generally means that the battery (batteries) in the media block or integrated media block, as appropriate, are failing and should be replaced ASAP.  If this is not addressed in the immediate future the batteries will drop below the minimum required voltage to maintain the security certificate in the server and the media block or IMB will be bricked and require replacement.

When the following screen appears, the battery has failed completely and the media block (IMB) will need to be replaced.