If your Xbox 360 console has stopped working and you are getting the Three red light error don’t panic, there is hope. With some basic tools and a decent repair manual you can perform a Xbox 360 Repair it yourself.
You will need a set of torx screwdrivers, If you do not have a set you can pick up a cheap set at your local hardware store.
The Three red light error means there is a general hardware failure. First thing you can try is to dis-connect everything and let your console sit for 25 minutes unplugged from the power. Re-connect everything and try it again, If you are still getting the error remove the hard drive and re-install it. Sometimes they get loose and you get a bad connection.
If that did not repair it you will need to open it up at this point. The most common errors are no video or disks wont read. Both can be handled fairly easy.
If you have no video you can attempt a alternate video cable, borrow a friends if you do not have another one. If you still have no video but audio is working you will have to check the soldering connections on the main board for the video connector. Consult the Xbox 360 Fix manual before attempting this or any other internal repairs.
If your Xbox 360 is not reading the disks or getting disk errors make sure your disks are clean.You may have to replace the DVD drive or if you have the skills you can take out the DVD drive and replace just the pick up assembly. This is a lot cost effective than replacing the entire drive. Again look at the repair manual before attempting this.
Your other choice is to send your system off to Microsoft and Wait. Nothing worse than having Halo 3 and not being able to play it. I prefer to do my own mods and fixes. The console unit is very similar to your home computer, it is actually a small computer. With a little patience anyone can learn how to do there own repairs.