Centos 4.4 CLI - Can't Detect or Mount USB Key and Disk

[Linux Noob With Server]

Good Evening All,
I have the following setup:

DELL Poweredge 2550
running
Centos 4.4 server CLI

I am trying to mount a 1TB external Hard disk via USB and a USB key to the system but I can't seem to detect or mount either. When plugged in they both light up and get power for about 20 seconds, then they power off. Can anyone offer some assistance?

[devils casper]

plug-in External disk and execute this

tail -s 3 -f /var/log/messages

note down device name assigned to disk and mount it. check the output of fdisk -l command too.

[Linux Noob With Server]

Tried that, couldn't see any entries relating to drives. Do I need to install any USB packages to get the ports recognised?

PS - Both drives mount fine under Knoppix on my latop

[devils casper]

does fdisk -l show partitions of external disk?

[Linux Noob With Server]

Disk /dev/sda: 209 MB, 209715200 bytes
255 heads, 63 sectors/track, 25 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 25 96390 8e Linux LVM

Disk /dev/sdb: 1610 MB, 1610612736 bytes
255 heads, 63 sectors/track, 195 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 195 1566306 8e Linux LVM

Disk /dev/sdc: 103.7 GB, 103735296000 bytes
255 heads, 63 sectors/track, 12611 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 * 1 12611 101297826 8e Linux LVM

NB - It is the same with the drives connected / disconnected...

[devils casper]

plug-in External disk before booting up and check if CentOS recognize it. in case it doesn't work, unload and reload uhci_hcd module.

rmmod uhci_hcd
modprobe uhci_hcd

plug-in External disk.

[Linux Noob With Server]

Thanks for the help Casper! I had to use OHCI not UHCI but it worked. That was the issue. Still getting my head around why it worked (trying to understand it all) but it worked. Thanks for the help!