SO you have an XBOX 360 and it has the dreaded little brother or the red ring of the death, the open tray glitch. The open tray glitch prevents you from playing games on discs because it cannot read the disc because the laser is at the end of the disc drive and wont go back to the front. THe solution however is simple and there is two ways you can do it.
If you don't have a warranty or have modded your 360 then open it up and manually push your laser to the front of the disc drive. Nothing fancy just move it up with your fingers.
For those of us who are either lazy or don't want to invalidate our warrantyt then do this technique.
1) Pick up the XBOX 360 that is lying in the horizontal position.
2) Tilt it 45 to 90 degrees.
3) Place the XBOX 360 on your lap and smack it against your lap like you are putting the head of an axe back on the handle.
4) Plug it back in and play your game.
Remember to make sure there is no disc inside your XBOX before doing either of these techniques. I also am not responsible if you manage to screw up your XBOX doign either of these techniques. The second option worked for me twice and i highly reccomend it to anyone who still has a warranty but deoesn't want to send their XBOX to Microsoft.