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NZHawk
08-08-2011, 11:26 AM
I have a computer that is dropping the usb ports.
What I mean is the computer recognizes a flash drive is plugged in but
shows nothing on it.
They showed up when booted up and can see the documents on them
half an hour later they have disappeared.

I went to attach something to an email and found the drives were no longer reading.

The drives themselves are showing up on the file menu (although they have changed names i.e. e:\ become f:\, j:\ became k:\ etc,

but its not showing up their contents.

Even the external hard drive has gone missing.


The device manager does not show any faults.
Could someone suggest a repair approach.


Thank you

Speedy Gonzales
08-08-2011, 12:13 PM
Delete the USB entries in device manager then reboot. What version of windows is it?

NZHawk
08-08-2011, 12:16 PM
Windows XP

Speedy Gonzales
08-08-2011, 12:29 PM
Is it up to date with SP3?

NZHawk
08-08-2011, 12:30 PM
Yes

Speedy Gonzales
08-08-2011, 12:31 PM
Have you tried deleting the USB entries then rebooting yet?

NZHawk
08-08-2011, 12:33 PM
sorry - not yet - unit is at another location will try and report back.

Speedy Gonzales
08-08-2011, 12:36 PM
Use teamviewer if its online then delete them

NZHawk
08-08-2011, 12:38 PM
Roger

NZHawk
08-08-2011, 12:47 PM
rebooting now

NZHawk
08-08-2011, 01:49 PM
Ok
two devices showed with yellow !
VIA usb enhanced host controller (Device cannot start code:10) and
usb mass storage device
I had the two usb flash drives and the sd flash card pulled
had the two usb flash drives re-inserted -- they seem to be working but
I am still left with the
VIA usb enhanced host controller (Device cannot start code:10)

Speedy Gonzales
08-08-2011, 02:08 PM
Is this onboard USB or a PCI card?? I know with PCI cards, if its got a molex adapter on it. It needs to be connected. Or thats what can happen

NZHawk
08-08-2011, 02:10 PM
It has both onboard & and extension slot with 2-usb slots & 4 SD Flash card slots

Agent_24
08-08-2011, 04:19 PM
Might want to give a try upgrading the drivers from: http://www.via.com.tw/en/support/drivers.jsp

Also I find USB Flash drives and Bus-powered hard drives generally seem to work best on rear (motherboard mounted) ports.

Some front ports are connected via crappy cabling and for high-speed bus-powered devices you will get all kinds of problems, even if externally powered drives and things like mice work OK.

NZHawk
08-08-2011, 04:39 PM
Agent_24 all good points thank you.
I did find though that when we moved the usb drive to the back port that we got the same problem,
drive being recognized but when open showed nothing in it
when in fact there were multiple folders and files.

Will try the driver upgrade - thank you for that.

NZHawk
10-08-2011, 11:29 AM
Looked this morning at the device manager & the "faulty" VIA usb enhanced host controller seems to have corrected itself but, we're still dropping or inaccessible usb.
I went to the Event Manager & there is quite a few errors under System:
I will only post a few here, but if someone could help me understand what they are saying & direction I should take, it would be appreciated:
Type Date Time Source Category Event User Computer
Warning 10/08/2011 8:17:19 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:17:09 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. ftdisk Disk 57 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. ftdisk Disk 57 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:20 a.m. disk None 51 N/A MBHC
Warning 10/08/2011 8:00:00 a.m. disk None 51 N/A MBHC
Information 10/08/2011 7:59:53 a.m. Service Control Manager None 7036 N/A MBHC
Information 10/08/2011 7:59:52 a.m. Service Control Manager None 7035 Helena MBHC
Information 10/08/2011 7:59:52 a.m. Service Control Manager None 7036 N/A MBHC
Information 10/08/2011 7:59:39 a.m. Service Control Manager None 7035 SYSTEM MBHC
Information 10/08/2011 7:59:25 a.m. Service Control Manager

Agent_24
10-08-2011, 11:36 AM
Not sure what those errors mean. Go back to the System log and double-click on an error. You should get a more detailed description. There's even a little button to copy the whole lot to clipboard so you can paste it here.

By the sounds of it though, you've either got some weird driver problems or faulty hardware.

NZHawk
10-08-2011, 11:43 AM
Thank you Agent - um the computer is at another location will need to coordinate to get the data. will report back later
Thank you

Agent_24
10-08-2011, 11:54 AM
If you can, you could try getting the user to boot a live Linux CD like Ubuntu :waughh:

Then if the USB works fine, you can eliminate a driver problem.

NZHawk
10-08-2011, 11:56 AM
excellent suggestion
- will do and report back

Speedy Gonzales
10-08-2011, 02:10 PM
Are you or whoever, ejecting these USB flash drives, before removing them?? Thats what Event ID: 57 may mean. If they dont it may corrupt it sooner or later. Whats this extension slot?? Is it a PCI card or an adapter / cable that plugs into a USB header on the mobo?

dugimodo
10-08-2011, 02:13 PM
Ejecting is definately the safest way, but by default windows doesn't use write caching on removable flash drives so as long as you aren't currently reading or writing to them you can theoretically just pull them out safely without ejecting.

doesn't help you with your problems of course.

NZHawk
11-08-2011, 12:14 PM
problem continuing:
I booted to Ubuntu as previously suggested, assess to all usb flash drives & the SD camera card was successful.

I pulled a PCI extension usb port & disconnected the front panel SD card reader that has 1 usb slot in addition to the SD card slots.
Each time I reboot an error is generated:

Uli PCI to USB Enhanced Host Controller Service Failed to start - specified driver is invalid.

I have removed all the usb listed devices in Device Manager - with no resolve.

NZHawk
12-08-2011, 04:19 PM
I know I wasn't on-line for much of yesterday,
I would really appreciate any suggestions of how to resolve the usb problem above


thank you

Speedy Gonzales
12-08-2011, 05:01 PM
Format it, the OS the USB or the hardware is probably borked

Agent_24
12-08-2011, 05:45 PM
I guess it's likely to be a software not hardware problem, if the device works in Linux, although this is not a 100% guarantee (from my own experience)

If you've got a spare hard drive you could test again with a clean install of Windows on the new drive, before you go so far as to format and reinstall.

However that may be the best (read: quickest and easiest) way to fix the problem.
You might spend a week trying to fix up the drivers and registry entries etc and still not get it done.