Missing USB Drives

I have multiple external drives connected via USB to my iMac. Recently two Western Digital drives stopped appearing. I can hook them up to my MacBook and everything is fine. I tried disconnecting and connecting multiple times but no improvement.
Any ideas?

Zap the PRAM and Reset the SMC; then, try mounting them again.

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Missing USB driver / dongle for HP Wireless Elite Desktop v2

Hello there,
I recently lost my usb driver / dongle for my keyboard and mouse (HP Wireless Elite Desktop V2). I am unable to use both keyboard and mouse.
What is the solution for this problem. Can you send me a replacement usb dongle / driver. I sincerely appreciate your help.
Thanks and regards,
Samy Pal

Samy,
The Elite Desktop v2 uses Link 5 technology but my understanding is there is no individual Dongles available.
You would have to buy a whole new Mouse, etc, etc. to get a new Dongle.
You can always contact HP Support directly for your area/country and ask them yourself.
HP tech support/ customer service phone number to call
This forum is a volunteer service and not a direct portal to Support.

"Missing usb driver."

When I try to print to my Lexmark printer I get the above error message. I have updated the software. How can I remedy this?

Samy,
The Elite Desktop v2 uses Link 5 technology but my understanding is there is no individual Dongles available.
You would have to buy a whole new Mouse, etc, etc. to get a new Dongle.
You can always contact HP Support directly for your area/country and ask them yourself.
HP tech support/ customer service phone number to call
This forum is a volunteer service and not a direct portal to Support.

Missing USB class driver for Lexmark X7170

I just upgraded to Leopard and everything went fine but the USB connected Lexmark X7170 errors when printing with this message:
/usr/libexec/cups/backend/usb failed
Missing USB class driver
I did reinstall the Lexmark printer app but no luck. The app does run but missing USB driver still. Posted email to Lexmark but no reply.

Have same problem with Lexmark X5490 - in fact I used it OK under Tiger but wasn't ever able to use since upgrading to Leopard last year.

Adobe PS CS4 does not "see" my USB Drives in Finder

For some bizarre reason, PS CS4 is no longer "finding" my USB 2TB drive in the Finder/Devices window on my iMac (nothing is showing in devices). However, it is seeing my my WD NAS drives, and if I go into Finder on my own, it shows the USB drives. The WD drives are a 2TB MyBook, and a 3TB MyCloud. I have had some issues with _those_ drives showing up in Finder but its usually a WD firmware issue... and its usually the older MyBook drive that gives me problems. Anyway... the aforementioned 2TB USB drive also appears (as it should) on the RHS of my iMac screen. The drive is working just fine, and I have tried powering off the computer and the USB drive... still doesn't show using Photoshop. I can search within finder for the file I want, and right-click to open in "Adobe Photoshop" but I'm so used to grabbing, editing, and saving files from within CS4 that I'm baffled that this drive all of a sudden can't be "seen" from within PS CS4. Previously it had been, so I have to assume its some settings or preferences issue?

As noted above, I am now able to "see" the missing USB drive(s) in Finder so that seems to be resolved. However, a few new issues have cropped up:
1. Not all my installed fonts are in my font listing, but I'll assume I can easily remedy that by activating them (I hope). I have the sneaking suspicion I deleted some by mistake.
2. Safari seems to have gone weird... the upper section is flashing like crazy when I try to type in a URL, also the sidebars flash when I scroll up or down with mouse. I've installed Chrome so I have a stable browser for the time being.
3. No matter what I seem to do in preferences, every new image I open does so within the same window so I have to manually drag it out to compare images. How do I fix that permanently?
4. When I first opened PS this morning I kept getting some sort of error popup that couldn't complete the request?
Is it safe now to remove the new user account?
Mike

USB Drives not always showing Finder

I currently have two USB Drives connected through a powered hub and they do not always show in the Finder window. Also when I pug in a USB memory stick it does the same thing.
I am new to Mac, I love it but this really bugs me. is there a setting somewhere, what is happening? If I disconnect then re-plug in the memory stick it shows up. What is really funny, that doing this also causes the missing USB drives to show up......

I tried that, but still no go with a thumbdrive. I can go to "Computer", and the USB drive shows up under that. All my other USB external HDs, my iDisk, and even FireWire drives show up on the left pane of the finder, just not the USB stick.
Any ideas?

I upgraded Windows 7 to Windows 8 with iTunes installed. Now my iPhone 4S is no longer recognized in iTunes. Connecting with USB sends me directly to the MS app that downloads pictures from the iPhone. Suggest this is a question of missing Apple driver.

I upgraded Windows 7 to Windows 8 with iTunes installed. Now my iPhone 4S is no longer recognized in iTunes. Connecting the iPhone with USB sends me directly to the MS app that downloads pictures from the iPhone. Suggest this is a question of missing Apple driver for Windows 8, iTunes and iPhone. MS does not care! This seems to be a general problem with Windows 8 that a number of drivers that used to work with Windows 7 now do not work, ie. iPhone to iTunes, HTC to HTCSync, Samsung to Kies etc. I need this connection to work in order to syncronize with Outlook and my iTunes library.

diesel vdub wrote:
Maybe it would have been a better idea to confirm that iTunes is supported in Windows 8 before buying a computer with that Operating System.
There will be a new version of iTunes released this month... no one forced you to upgrade prior to a supported version of iTunes being released.
Like the fact that you just called most of us stupid there

Trying to Print - Receiving "Missing USB Class Driver" Error

Since I upgraded from Tiger to Leopard, I have not been able to print. I have a Lexmark X5470. At first, any application that attempted to print simply crashed. Then, I removed the Lexmark folder from /Library/Printers, and did a custom install of just the Lexmark printer software from my Leopard DVD. Now the applications no longer crash, but I am getting this error:
/usr/libexec/cups/backend/usb failed
Missing USB class driver.
Does anyone know what this is? I have deleted the printer and re-added it, restarted the computer, disconnected the printer, etc...everything I could possibly think of.
Thanks!
(And Lexmark did tell me that they have no plans for making their software for this printer compatible with Leopard, so I need to get it working without their help.)

There are several posts here on the Lexmark x5470. One that mentions your specific problem is here:
http://discussions.apple.com/thread.jspa?messageID=5674001&#5674001
Other have had success using the Lexmark drivers and then disabling or deleting a plugin. There are several threads on this.
Hope this helps.
Message was edited by: John Blanchard1

Missing Apple Mobile Device USB Driver Missing From My Device Manager

Hi Everyone, My Apple Mobile Device Usb Driver Does'nt Show up in my Device Manager. But when i go Control panel>> Admin Tools>> Services its there but when i go Start>>Run type in devmgmt.msc an the device manager comes up an under the heading Universal Control Bus Contoller the Apple mobile device usb driver is suppoed to appear but it doesnt all my other usb attached devices do how do i fix this problem?????

For what it's worth. I had the same problem, and here is how I fixed.
I downloaded Roxio Uninstaller and deleted everything Apple. Itunes, Bonjour, Apple Mobile Divce Manager, and Safari, everything get rid of it all. the good thing about roxio is that you can scan for anything that the program uninstaller missed.
Then I down loaded itunes again and Whalaa! It now works.

My iPhone USB driver has gone missing

My iPhone USB driver has gone missing and won't recognize when I try to update from the device drivers... can someone give a suggestion on how to get it back? It went MIA when I upgraded to the newest iTunes today.

Burd
I'm sorry to hear your phone is not responding! I'd love to get it back up and running. Can you press and hold both the front button and the top button? You may need to hold it for a few minutes, but an Apple will appear when the device resets. Keep us posted!
RuthW_VZW
Follow us on twitter @VZWSupport

I know that my Apple Mobile Device USB Driver is missing. It won´t reinstall or update the software. Where can I get the software so I can synch my Ipod nano again?

I know that my Apple Mobile Device USB Driver is missing.When i try to reinstall it in the device manager it says that one of the installers is unable to reinstall the software. I don´t know where to look for the software to get the driver going again, so please help if you´ve got any solutions to my problem. I´ve spent hours and hours looking in the internet but i couldnt find anything helpful. PLEASE HELP
PS: I´ve got a Windows 7 PC so the guy from the Apple Store refused to help me

You need to completely uninstall iTunes from your computer and then download and install it again.
You do know that Microsoft has a web site, right?

Apple Mobile Device USB Driver missing Windows 8.1

Have just downloaded iTunes 11.3 but it now doesn't recgonize my 6th Gen. iPod nano. Have narrowed it down to a missing Apple Mobile Device USB Driver in the Device Manager but there isn't a potential alternative to the iPod i.e. another device to choose from.
How can I re-install/download this driver?
Thanks.

OK. I found my answer, thanks to another posting.
Uninstall iTunes
Uninstall Apple Software Update
Uninstall Mobile Device Service
Uninstall Bonjour
Uninstall Application Support....all in this order.
Clear everything from Trash.
Restart PC
Install latest version of iTunes.
It worked!

I'm missing the Apple Mobile Device USB Driver.. iPhone isn't recognized in iTunes?

I have tried re-installing itunes, restarting computer/ phone, disabling security software, different USB cords, etc.. I followed a page on apple (http://support.apple.com/kb/TS1538) and concluded I am missing the driver but none of the suggestions have fixed the problem.

See
iOS: Device not recognized in iTunes for Windows
- I would start with
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
or
Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
However, after your remove the Apple software components also remove the iCloud Control Panel via Windows Programs and Features app in the Window Control Panel. Then reinstall all the Apple software components
- Then do the other actions of:
iOS: Device not recognized in iTunes for Windows
paying special attention to item #5
- New cable and different USB port
- Run this and see if the results help with determine the cause
iTunes for Windows: Device Sync Tests
Also see:
iPod not recognised by windows iTunes
Troubleshooting issues with iTunes for Windows updates
- Try on another computer to help determine if computer or iPod problem

ITunes doesn't recognize iPhone and Apple Mobile Device USB Driver is missing

Hi. iTunes does not recognize my iPhone when I connect it to my PC via USB. I found iOS: Device not recognized in iTunes for Windows and went through the listed steps to diagnose the problem. The problem seems to be the Apple Mobile Device USB Driver. It is not listed in Device Manager and it does not seem to be installed on my PC. I followed directions for "If the Apple Mobile Device USB Driver is not listed" and I was not able to find anything. In that case there are no further steps that you can take listed on iOS: Device not recognized in iTunes. I then uninstalled and reinstalled iTunes and other software components (http://support.apple.com/kb/ht1923) three times but each time Apple Mobile Device USB Drive was missing. If anyone can advise me I would greatly appreciate it.
iTunes: iTunes 11.1.5 for Windows
iPhone: 4.3.3
PC: Windows 7

See TS1538: iOS: Device not recognized in iTunes for Windows, in particular section 5.
See also Troubleshooting issues with iTunes for Windows updates.
tt2

Apple Mobile Device USB Driver is corrupted or missing

it started when i updated the new version of iTunes (10.3) and when i connect my iPhone 4, it doesnt show up on my iTunes. I checked everything and i narrowed it down to Apple Mobile Device USB Driver under Device manager, i looked it up, clicked Properties and it says "Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)". I really dont know what to do with this. I cant connect my iPhone 4 or lets just say iPhones or iPods in general because im having problems with the Apple Mobile Device Software.
BTW, My iPhone and my iPods dont have any problems, they charge.
Thanks for your responses and help! i really appreciate it!
I have a Windows Vista 64 Bit Version

b noir wrote:
Okay ... I think we'd better try a complete uninstall/reinstall now, speed. For instructions, see:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
I'm in the process of deleting the programs (iTunes, Bonjour, and everything related to iTunes/Apple). By the way, i did the complete uninstall and reinstall but the thing is, while i was downloading iTunes, theres a pop up that says
it will rollback the installing process but the computer will try installing it again, i have the previous version 10.2.2, i download the old version and still have the pop up but i cimpletely installed iTunes

Missing USB Drives

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