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I have an HP DC7900 with Windows XP SP3 installed on it. I also have a Digital Recorder DS4000 but it's the only USB device shown in my computer. The CD drive has gone...

Has anybody seen this issue before?

I also tried the Microsoft fix at the following address without any success

Any help would be really appreciated!

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I was going to suggest the fix-it. :( Are you sure the drive hasn't come unplugged internally? Does it work on another machine? Did you just install iTunes? – Shinrai May 3 '11 at 15:48
Is it visible under device manager? – Sathya May 3 '11 at 16:03
@Sathya: It's not visible in Device Manager but it is in the BIOS. I don't get it... And yes, iTunes has been installed quite a back ago but updated recently. – r0ca May 3 '11 at 16:32
Do a quick check under your System Errors , do you see anything unusual? Maybe disk errors, for example? – rlb.usa May 3 '11 at 16:52
Sathya has a good point. It is possible that there was a hardware failure and Windows can no longer 'see' the device. – Justin Pearce May 4 '11 at 18:28

I had a similar problem a few years back and this link saved me.

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At the moment, this post is essentially only a link. To make sure the answer remains useful even if the link breaks, please edit it to include the relevant information. (Your answer was discovered in an effort to repair or remove old link-only answers.) – Ben N Jan 10 at 4:46

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