1 red lights shows on

Maybe you dont't keep ot in a good cooling area. The same thing happened to me. Do this:
Take out your hard drive and let it cool for 5 mins.
Dissconnet all the cables including the controlers.
When your done dissconnet the power cord.
After this is done let the xbox cool for 5-10mins.
Reconnect everything except the hard drive then see if it works. When the xbox is back to normal it is safe to put the hard drive back.

its a hard drive error (overheating)