USB port causes restart loop

Hi,
After getting an error from an external drive, I am stuck in a loop where my MacBook keeps restarting.
Starting up in verbose mode, I get the message:
*AppleUSBHubPort Port 1 of Hub at 0x1a000000 about to terminate a busy device (IOUSBCompositeDevice) after waiting 10 seconds)*
After about two minutes, a "killall" command restarts the machine, and hence the loop.
I have tried the following:
* plugging in "good" usb devices
* PRAM reset
* SMC reset
* fsck command (disk checks out fine)
* DiskWarrior (disk fine again)
The machine will not start up from the startup disk either, with the same loop.
The only thing I am able to do is write commands in single-user mode, so perhaps someone knows a command to reset the USB controller?
Any help greatly appreciated!
Christian

How many devices do you attach?
There is limited juice to the USB ports. If you attach an external self-powered USB hub, then that relieves the burden on the internal power bus and can help. Regardless of fixing the problem, it is a good idea.

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Hoping I am posting this in the right place. So, just recently Ive been having some problems with my HP Pavilion laptop. Having a mouse plugged into any of the three USB ports causes sound lag, fps drop and stutters on the movement of the mouse.
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@-Banzai- ,
Hello and thank you for posting on the HP support forums. This may be due to recent windows updates.
Please try doing a system restore back before the problem started.
Using Microsoft System Restore (Windows 8)
If that does not fix it then check this out.
Go to control panel, system, device manger....under Human Interface Devices, delete all items and reboot. The system will reinstall the drivers and hopefully your mouse will work.
Please let me know how things go.
Thank you again for posting and have a great day.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
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This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

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Welcome To Lenovo Community
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Cheers!!!
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Hey guys
I have this problem on my late 2011 Macbook Pro 13 inch,
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ElectroSpyzz wrote:
Hey guys
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