I would send it in, or take it back 2 the shop u bought it from. the guide might require extra parts as well, and u could totally ruin yur 360.
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Systems-
360 ELITE 120 GB- markyrulesok
PS3 60 GB- msparky
PC-
4 GB RAM, HD 4850, 320GB HDD, AMD PHENOM QUAD CORE 2.66.
Playing- left 4 dead, s.t.a.l.k.e.r, GTA 4, FALLOUT 3