One day i was playing G.R.A.W havin fun, then the 360 froze i turned it off thought nothing of it.
next day.... 3 light error, i was pissed, well after hearing of the hot air gun fix i thought i should do that but i dont wanna void the warrenty.
i tried repeatedly to get the xbox to turn on and work and after a while it flipped on. i was stunned, why wasnt it working a second ago?
so again i turned it off went to sleep, after a couple hours of sleep i wanted to play again, and again, 3 light error GRR i was mad.
so i let it run with the 3 light error to think about what its doing to me by not letting me play, and i turned it off and turned it back on quickly, and boom it worked.
I dont know if this will work for everyone but it did for me, and now does everytime.
Just my 2 cents. helping any way i can.