In Game Reset "IGR"

From Zack's Wiki

IGR : In Game Reset

Modified Xboxen, softmod or modchip, include a feature similar to Ctrl-Alt-Delete in windows called I.G.R. for In Game Reset. Spazzing out while playing halo with IGR enabled will usually result in a rebooting xbox. This usually happens at the most inopportune moment when someone is about to score. IGR combinations differ from modchip to softmod, some as simple as pulling both triggers and pushing both sticks will reset the Xbox, where some modchips are tricker, requiring both triggers to be pulled and the Start, Back, White and Black buttons to be pressed simultaneously.