It is normal for the non-powered device to be removed from the Device
Manager USB listing. However, the entry should return when the device is
re-powered. You won't see the Device Manager entries updated unless the
USB group is closed and reopened or Device Manager is closed and
restarted.
Where is your system failing? Are you saying that exiting and restarting
Device Manager does not add the re-powered device to the USB listing?
Scott:
Setting aside (at least for the moment) the listing or absence of a listing
for the USB device in Device Manager...
When you speak of the problem of non-recognition of the USB device (USB
external HDD? flash drive? and such, yes?) - you're referring to the fact
that data on these devices cannot be accessed through Windows Explorer and
they're not listed in My Computer, right?
Try this...
After you reconnect the USB device, access Device Manager, highlight the
"Disk drives" listing, click on the Action menu item and then the "Scan for
hardware changes" item. That might do it, but then again, it might not.
We've come across a number of motherboards (particularly older models -
pre-USB 2.0, but also some newer ones) that simply will not recognize a USB
device that is not connected at bootup. To make matters more puzzling we've
encountered motherboards having the reverse problem - the system wouldn't
boot while the USB-powered device was connected, but there was no subsequent
problem connecting the device following bootup.
You might also check with the motherboard's manufacturer to determine if
there's a BIOS upgrade for the fix.
Anna
