Windows 7: Network device total gone.

I have a problem that maby needs a rapair. or new motherboard.

Problem is when i was going to start my computer, i found out before i start boot, the internett connection cabel dosent light. strange i think, and tryed a new cabel. nothing happend. then i start the computer to try to turn back the computer. that was a problem and it cudent do that. then i start the computer and look at device manager. driver says the network connection is on deep sleep mode. i cudent turn that off / on becuase i cudent find the device. i cudent find anything on my windows 7 controll panel for my network device, adapter. i use a realtek network driver for my m4a89td pro card from asus.com

i have got help from komplett.no to send the motherboard inn and let them look at it. and i have still inn the 1 year garanti is it better to repair it or buy new motherboard? or any help about this before i send it inn. i will send my motherboard at monday.

-Kim