Had this problem for a few years, but hasn't really bugged me until lately when I need it!!
I have a Dell Studio XPS M1330 Laptop, has NVIDIA motherboard. I think ever since I purchased the PC this problem has occurred.
Problem: NVIDIA nForce 10/100/1000 Mbps Ethernet card will only detect an ethernet cable when I restart. The minute I unplug it, it will not detect it if I plug it back in. I have searched high and low for a solution but have not been able to find one that works. I have disabled the sleep setting on the device and made sure the computer is not allowed to turn off device to save power. Drivers
Please help if anyone has an idea. I have a lot of knowledge with computers so you do not have to dumb it down....although I can't figure this one out!