While playing Halo3 i noticed that my xbox 360 wireless controller wont look up or down. If you try to look up or down it barley moves. What should i do.

Sounds like more of a problem with the game not the console. I would try other games in it, and see if those work. If not, then something might be messed up with the console itself. But that's what i would do...

To fix your controller , go to the "Options" menu in C.O.D. and select "Controller," then click on "Normal". It should be set on "Invert" right now. You want to change it to "Normal"

If you bought it brand new, contact Microsoft ASAP.

Otherwise, no luck. Just an unfortunate side affect of playing a 360.

maybe you just scratched it or it is your laser in your disc drive

When i try to play halo3 with my friends i get the same problem. I cant connect to them and sometimes i also cant hear some people talk. Some problems might be that your NAT is set to STRICT or MODERATE you will want it to be open to play with your friends. I dont really have an answer but you will need to get in your apartments router to change the settings to get the NAT to become open. If you type in on the google search bar: Cant connect to friends on xbox live there will be some answers for this problem.

i will buy it from you

Wow i have no idea what to do with my Xbox #360 Elite. I was playing halo3 and my screen started acting up, and the colors on the tv were flashing.. red pink green and blue.. but i could still play.. so i shut it down then turned it on and had no picture

You either have a damaged disc or a copied version if you're trying to play a copied version of the game online you could get banned.

http://www.xbox.com/en-US/support/systemuse/xbox360/gameplay/discreplacement-program.htm

Wait a couple of hours. The other day it was doing that to me so I waited a while and it worked. (Halo 3)