I bought a broken Xbox, and it says "Your Xbox requires service. Please call Xbox Customer Service." when I turn it on. The front LED also blinks red and green. It does this with or without a game. I think it is a really old Xbox. Does anybody have any ideas on what could be wrong? I opened it up as far as I could, but couldn't see any obvious problems. It did not look like it was opened up previously, although it looks like someone tried.
Any ideas?