hi all. i'm facing a new annoying problem. i format the PC, but the built-in network card keep giving me, "No Network available", i tried to uninstall the driver and reinstall it, disable the the device and enable it, unplug the cable and replug it, and somehow it detect it but after long time, and the internet still slow. and every time i restart or shutdown the PC is the problem come back, and of course i repeat every thing above. i can't connect to internet unless i disable the Network Card for 10 seconds and re-enable it. the problem is still exist even after a reformat. the troubleshoot tell me there's a problem like "Local Area Connection doesn't have a valid IP configuration" what should i do ? and thank you.