HP 6715b LAN Card Disappears

I have a user with an HP 6715b laptop where the wired LAN card keeps on disappearing from Device Manager.  The only way I can bring it back is to disable the internal 1394 card, and then the LAN card comes back.  This only works temporarily though.  Last week I disabled the 1394 right inside BIOS and she was good for a week.  I just got a call this morning and she tells me that her wired connection isn't working again.  I haven't had a chance to look at it today though as she is offsite.

Any ideas?  I've looked for a BIOS update for this machine on the HP site and can't find one.  I also tried a D-Link USB/Ethernet adapter and I can't get that to run either.  It fails on the install.

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Brad Sims, CCNANetwork AdministratorCommented:
What is the error you get on install of the USB adapter?  There are only a few things I can think off right off the top:

1.  The LAN card is failing (it happened to one of my computers with an external video card).  I would search HP's website for an updated driver and give that a shot.

2.  I was thinking the power management feature was shutting down the card.  Have you checked the power management feature?

Try these and let us know what the results are.
gunscheeAuthor Commented:
"I was thinking the power management feature was shutting down the card.  Have you checked the power management feature?"

I just checked this and sure enough it was set to shut it down.  I unchecked all of that.  

Could it be that once that was invoked it was getting stuck in that state???  I've never seen that before.

Actually when I first turned the laptop on today it was running on battery and the LAN card was not present in device manager.  Plugging it in to AC made the LAN card show up, and that's when I went in and found that it was set to shut itself down via power managment.  This doesn't explain why the user gets into a mode with it that the card never shows up after a while.  I know they're using the wall adapter with it.  ???
Brad Sims, CCNANetwork AdministratorCommented:
"Could it be that once that was invoked it was getting stuck in that state???" - It very well could be.  HP's product bulletin says that these laptops use a Broadcom adapter, and I have had trouble with those in desktops several times.  My problem was more easily resolved than yours because I just changed the card.

Just from reading your comments it sounds like the card is malfunctioning.  Have you been able to install the USB adapter?

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gunscheeAuthor Commented:
I just tried and this time i was successful.  Turns out  I have revision B1 of the Dlink DUB-E100 adapter and the CD that came with it is for an older one.  I grabbed the new driver off of the website and this time it installed.  I'm going to have the user try this arrangment for a while.

Thanks for your help!
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