2) Run memtest86+ for a full pass without errors to check out the ram first. If you get any error, test each stick and slot individually to identify the failed part.
3) The 4/8 pin cpu power slot may be OK if your cpu is not a strong one; a E6600 is not strong. Read the motherboard manual for more info. Most of the time it does not need the 8 pin connector unless you are overclocking or have a highly clocked quad. An molex to 8 pin adapter adapter would work also. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
That said, a quality psu like whitefang suggested is a good thing.
Memtest says rams fine. Got an error about the lan card and disabled it in bios. Tried to reinstall then got a ntfs error code during install. Thinkin bout returnin mobo and ram and startin over. After readin some reviews I think I made a mistake with that mobo in the first place.
I think a 9500GT will be marginal gaming at 1280 x 1024 resolution. For good gaming at that and higher resolutions, you should be looking at a stronger card like the GT240 or gts 250. The cpu will be fine.