Ok so earlier today I built my first computer and despite a couple of niggles, all went well. I've installed windows 7 and all the components are functioning, however when I put my Ethernet cable in, and nothing happens! I ran the software for my router but that couldn't detect a cable either. Also, when I tried installing a game (Oblivion) it refused to run and it said I was using a generic vga adapter as opposed to my Sapphire 6870 which is properly installed. Why is this happening? Apart from a rough cable management internally my computer is fine. Any help would be greatly appreciated.
Also while checking my temps in the BIOS it said that the CPU was Idling at 50 Degrees Celsius, which seems a bit high to me, and I couldn't find a heat temp for my GPU, does this mean it isn't installed?