hey..i think i'm in the end..but i need help with some door in Red's room...

[almogpr]

hi guys..look..i got to Red's Room and i burned him (he was in some machine that burned him) and then i got the key out..i opened the other door and there was his stuff...now there was another door big one.. sealed very hard..and i cant open it..it said that i need to cut the power off...which power???...where do i need to cut down the power...this is what i need to do..can some one help me plz??