Mac Pro no longer mounts external usb devices

Hi there,
Last week my mac pro stopped mounting my ipod shuffle as a disk (i was using it like a usb memory stick), i thought it was a problem with the shuffle and left it aside. But just yesterday the mac stopped mounting my external lacie 500gb disk. I had never had any problems before this.
I then tried both the shuffle and external hd on my powerbook g4. They work perfectly!
I then thought it might have been a problem with the usb ports on the mac pro - although all my other usb devices were still working - so i booted into xp with bootcamp, and the devices were recognised in xp perfectly.
After searching various threads on different forums the general idea for this problem seemed to be to reinstall osx, which i have just done, and no joy. Im still not able to mount either of these devices.
System profiler sees the devices, but thats it.
Also, i recently bought a new usb memory stick (as i thought the shuffle was dead), this mounts and works perfectly!
Anyone got any ideas?!
Thanks

Yes, i did the combo update immediatly after reinstalling osx and before pluggin in the usb device.
The problem developed just before the release of 10.4.9, so i dont think it was the update that did it.
I've only just got this MP back from Apple. The PSU had to be replaced. It took them nearly 3 weeks to do

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Mac Pro no longer mounts external usb devices

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