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.