My Xbox 360 is in black and white, it also has no sound!!

Look like ur Xbox 360 AV RCA cables is not making contact to the input board very well.Take some rubing achahol cleans the all those input holes,take the RCA AV connections make couples twises to the red,yellow and white,will help.Make contact with ur input board it should work.

Sorry but the system you bought was refurbished. Game Stop to me is like a dollar store F them. All they sell is used traded stuff.

alright. make sure that your red, green and blue are all plugged in properly and that your audio plugs are also in there correct plugs. i think audio is red and yellow. correct me if im mistaken

to start off,what type of cable are you using??
since you've already tried using 2diff TVs,basically its with the console

try using a different AV CABLES, if it still doesnt work,try calling xbox support hotline for possible replacement of your cable or for processing a repair for the xbox if necessary..

since you just bought your console,try going back to the store where you bought it and have it replaced, because for the repalcement of the cable if you call xbox support,it will take 8-12business days for toureceive it and 2-3weeks for the turn around time of the repair for the xbox.

definitely sounds like it is a problem with your vga cable. i would suggest trying a different one.

i think u might be getting the red ring of death my xbox did the same thing and a month later i got red ring

try Team Hybrid's Ultimate X-clamp fix

if its less than a year old phone Microsoft customer support.
if not it could be early signs of 3 red lights

If you have a HDTV then you need to change the resolution to 720i or 720p to support the XBox 360 HD video. If you have a standard TV (non-HD) then you'll need to change your XBox 360's video settings to non-HD. The problem sounds like your mixing up HD video signal. I really need more info about your TV. Is it HD? Or regular?

Do you have it hooked up straight to your tv or is it hooked into a System Selector? Your cables might be going bad, or what ever you have cables plugged into is going bad.