Ethernet adapter problem

I recently reformatted my brother's PC running this motherboard, and I have a similar issue with the nic. I get all connect lights to my router and from the card itself, and I'm online now on my computer on the same router. Have gone thru all the restarts and resets, have attempted to install drivers for it, several times, it won't take the drivers. I don't know why, I run the driver install (both from the mobo CD, and some I've downloaded from this machine and moved to the old one via a USB flash drive) when using ipcfg from cmd promt it still lists nothing, which tells me the stupid mobo just won't recognize any of the drivers I'm feeding it. Still working on a work around *sigh*

What it sounds like is that you didn't install the drivers. In order for sound and ethernet to work, you must first boot up the CD that came with the motherboard and install the Drivers.

I am having the same problem with my ASUS P4P800 motherboard
I have just connected up with aol broadband I checked the device manager and found that my drivers for the ethernet card were not loaded unfortunately the cd disk that came with my motherboard and the manual have been inadvertently lost lol so I am now trying to download them from asus site in the mean time if that situation does not work I will have to buy an ethernet pci card and try that lol

There is not enough information here to be able to identify to a great degree of accuracy what the true problems could be, but I will take a stab anyway. Is it safe to assume that the current configuration has been working in all 3 aspects during the previous 9 months? If this is the case, it is possible that your modem (if it is a cable modem) may need to be reset to acquire a new address. The activity and collision LEDs do not necessarily tell you that you are connected. The headphones problem...possible that you inadvertently disconnected the motherboard connector and placed it on incorrectly while researching one of the other issues? This could also be the case for the audio connector. Double (and triple) check all cable connections to the motherboard to ensure they are in the correct orientation and location. If the above is insufficient feel free to post more detail, such as did it previously work, did you previously install any new hardware and/or software, thunderstorms in the area recently, changes at your ISP? Good luck.