Mac Pro can't recognize 1GB Pen Drives... How to fix it?

Recently I keeps encountered the same annoying problem...
My Mac Pro can't recognize the USB pen drives when I or my co-worker plug into Mac Pro's USB port.
For a few times, if we are lucky, Mac Pro shows the pen drive on the desk top, but sometimes it can't read or write the data from/to the pen drive, many times, it simply freeze over.
Does anyone knows how to fix such problem? It seems to me that the new Mac Pro still has some bugs needs to be sort out...
Thanks in advance.
KC

Hi, Malcolm:
Thanks for the post.
No, my new Mac Pro system does not have USB port on the Keyboard, cause I've opted for Apple's wireless blue tooth mouse and keyboard.
I do have 2 USB ports on the Apple's 23" LCD display, and Two USB ports on front side and two available USB ports on the back of the Mac itself.
During the Thanksgiving long weekend, I think I might accidentally singled out the cause of my problem.
I have my HP printer and one multi-card reader constantly pluged into the two USB ports at the back of my Mac, and always tried to use the front side USB ports for the 1GB USB Pen Drives, and that's where the problem lays!
When I unplug the Multi Card Reader from the back USB port, and suddenly all USB ports on my Mac works just fine with the Pen Drives!!!
So, for now, I plug the Multi Card Reader in one the the front USB port, and the rest of the USB ports on the Mac work with Pen Drives flawlessly, it seems that I sloved my problem for the time being...
As for those two USB ports on the back of my 23" Apple Display, They can not take my USB Pen Drives, as you've mentioned that it does not have enough power for the USB Pen Drives.
K C
Mac Pro 2x3GHz Dual-Core Xeon, Power Mac G4 dual 1G MDD, 5G iPod 60G   Mac OS X (10.4.8)  

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