E74 Error
An E74 error is indicated when the lower-right quadrant of the ring indicator flashes red and displays an error message in multiple languages: "System Error. Contact Xbox Customer Support", with the code E74 at the bottom . The error is caused when there's a video problem, because the Xbox 360's hardware scaler chip is damaged. As of April 14, 2009, the E74 error is now covered by the three-year extended warranty, and customers who previously paid Microsoft for out-of-warranty service to correct the E74 error will receive a refund.
It is worth noting that the E74 error is displayed in the Screens of Death article as a "Green Screen of Death" and a "Black Screen of Death" because early versions of these errors had an almost jet-black background with a hue of dark green. Later versions would show a completely jet-black background. Reports of impending Q4 red-light failure stem from users who report an abnormal display with poor, grainy video as well as black dots/artifacts appearing on the screen. Vertical green or red strokes on the screen can also indicate an E74.
Read more about this topic: Xbox 360 Technical Problems
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