Hello. I have a client who has an HP Probook 6550d that has a NIC that seems to be in conflict with an unmanaged HP Procurve 10/100 switch. The place of business is on a single network and is using two unmanaged switches. When the laptop is connected to one switch the NIC will not stay connected. The link light flashes on and off on the switch and the NIC. The laptop is running Windows 7 Professional 32bit and shows the NIC connecting and disconnecting. When the laptop is patched to the other switch it works just fine...it doesn't disconnect. This laptop has an Intel 82577LC Gigabit NIC.
This laptop is two months old. It worked just fine up until this week. The client is using Cat 5e patch cables. I have tried using different patch cables and have tried updating the NIC driver. I did find that setting the NIC for 10 mbs full duplex seemed to help but did not last. Any ideas?