MBP will not boot when a USB/USB2 Device is plugged into either USB port.

MBP hangs on the initial Gray Screen when anything is plugged into either of my MBP's USB ports on boot and reboot. I've tried it with a USB mouse, USB2 Hard Drive, USB Memory Stick and USB RF Mouse. It DOES NOT happen when anything is plugged into the Firewire 800 port, only either USB port.
It happens on reboot and a fresh start whenever something is plugged into either of these two USB ports. I've let the gray screen sit overnight, just to see if it would enter the Login Panel. Didn't happen.
As soon as I unplug the USB item, the HD whirls up and a few seconds later the booting continues as normal. I have booted in verbose mode just to see what the system says. It stays on the gray screen, again, until I unplug the USB device. However, the screen does note the following:
"The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 3 of hub @ location: 0x6000000)."
The above error may or may not be related.
........AND BEFORE ANYONE SUGGESTS IT, YES I HAVE ZAPPED THE PRAM and reinstalled the OS from new MBP Install Disks from scratch! Still occurs.
Hope someone can also validate what I've wrote with the newer MBP, as well.
Many Thanks!

JKosh wrote:
MBP hangs on the initial Gray Screen when anything is plugged into either of my MBP's USB ports on boot and reboot. I've tried it with a USB mouse, USB2 Hard Drive, USB Memory Stick and USB RF Mouse. It DOES NOT happen when anything is plugged into the Firewire 800 port, only either USB port.
It happens on reboot and a fresh start whenever something is plugged into either of these two USB ports. I've let the gray screen sit overnight, just to see if it would enter the Login Panel. Didn't happen.
As soon as I unplug the USB item, the HD whirls up and a few seconds later the booting continues as normal. I have booted in verbose mode just to see what the system says. It stays on the gray screen, again, until I unplug the USB device. However, the screen does note the following:
I'm having exactly the same problem with my MacBook Pro.
It's either the usb hub or simply the iphone... every time I need to boot my macbook pro I have to disconnect every device. It's getting quite annoying.
The previous 17" Powerbook G4 had no issues.

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