3 red lights

When the Xbox 360 overheats it causes the lead free solder to crack, the more that crack the worse the
machine will get. So eventually I suspect your machine will die completely and show either 3rrod or e74.

To remedy this you need to strip the console down and replace what's called the X-Clamps, at the same
time replace the heat-sink paste and then you need to re-heat the whole board. We use a special IR over
which re-bakes everything and re-seats the solder properly, a lot of people use a heat-gun but you have
to be very careful.

you have the red rings of death which means that your xbox 360 is over heating or needs the rrod repair there are parts you can buy on ebay and guides to fix this problem if your confident enough to void warrenty cause you have to take the xbox apart and remove and replace the x-clamps that are on the bottom of the motherboard and it is a pain cause i ve done that repair on mine or you can find a repairer in your area to repair it for you