All of a sudden, when I restarted my computer, there was a little yellow triangle on the network symbol. Then, I restarted my router, still there. Restarted computer, still there. Restarted computer and router at the same time, still there. Connected directly to my modem, still there. Wifi works on my laptop, and I tried the same ethernet cable that is going to my desktop on my laptop, and everything worked fine. I did a ipconfig /release and /renew, and on the renew, it takes ages, then says "unable to connect to DHCP server. request timed out." Any help would be massively appreciated.