What happens if you get banned?

Ok i'm not an idiot. All my friends say if you get banned on halo 2 your only banned from matchmaking, well i am banned from mathchmaking. Now i installed a new hard drive and now i am suspended on the same account that im banned on... If i get banned will i still be able to play custom games?

 

yes u will still be able to play in custom games unless ur whole xbox gets banned...then ur screwed