USB ports only work when the device is connected at start up

I have a dv5-1110em laptop which I have upgraded to Windows 7.
If i connect a USB device before I start the machine then it works fine as long as I do not unplug it.
If I unplug a device and then need to use it again I have to restart the laptop.
If there are no devices plugged in at start then the ports will not work with any device.
I have installed the new BIOS.
I have uninstalled the USB ports and then re installed them.
I have been searching for an answer to this for months and found nothing that solves my problem.
Any suggestions would be greatly appreciated..
Thanks

I'm having the same problem.  Installed windows 7 professional over windows 7 home preminu.
Only see USB device if it's plugged in at startup.

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