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I have found quiet a few references to various ILPOWER errors on this site, but none the same as the error I am getting.

ILPOWER-3-CONTROLLER_ERR: Controller error, Controller number 4: has been reset unexpectedly or s2w bus err

Happens for controller numbers 3, 4, & 5.

Dissabling inline power has no effect.

Cisco Internetwork Operating System Software

IOS (tm) C3550 Software (C3550-I9Q3L2-M), Version 12.1(13)EA1a, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2003 by cisco Systems, Inc.

Compiled Tue 25-Mar-03 23:21 by yenanh

Image text-base: 0x00003000, data-base: 0x00654C9C

ROM: Bootstrap program is C3550 boot loader

GRALIBs1 uptime is 2 weeks, 4 days, 14 hours, 34 minutes

System returned to ROM by power-on

System restarted at 19:22:44 AEST Wed Dec 3 2008

System image file is "flash:c3550-i9q3l2-mz.121-13.EA1a/c3550-i9q3l2-mz.121-13.EA1a.bin"

cisco WS-C3550-24-PWR (PowerPC) processor (revision D0) with 65526K/8192K bytes of memory.

Processor board ID CAT0720R1RL

Last reset from warm-reset

Running Layer2/3 Switching Image

Ethernet-controller 1 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 2 has 12 Fast Ethernet/IEEE 802.3 interfaces

Ethernet-controller 3 has 1 Gigabit Ethernet/IEEE 802.3 interface

Ethernet-controller 4 has 1 Gigabit Ethernet/IEEE 802.3 interface

24 FastEthernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

The password-recovery mechanism is enabled.

384K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:0D:28:91:A5:00

Motherboard assembly number: 73-8100-07

Power supply part number: 341-0029-02

Motherboard serial number: CAT07200A1W

Power supply serial number: DTH07170R13

Model revision number: D0

Motherboard revision number: A0

Model number: WS-C3550-24PWR-SMI

System serial number: CAT0720R1RL

Configuration register is 0x10F



I am not sure how helpful this reply will be but here goes anyway....

You are running quite an old IOS release on that 3550, in fact I can't even find 12.1(13)EA1a on CCO. Therefore my first suggestion is get it upgraded to a later release. If you want to stick with 12.1 then 12.1(22)EA10b is the latest, however I strongly recommend that you upgrade to the latest 12.2 release - 12.2(46)SE.

Upgrading may not solve your problem however, but it is the first thing I would try.