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E73: General Hardware Error: Ethernet port... this error is caused by a problem with the Ethernet port. Try this troubleshooting. Remove the A/V cord from the back of the XBox 360. Stick two sticks into the fans to prevent them from spinning. This will cause the system to overheat within five minutes. You will know its done when the first and third quadrants light up red on the system (indicating the system has overheated). Unplug the system, plug it back in and turn it on to see if it was successful. (Note: While this method does not void your warranty, if your XBox is still under warranty I suggest sending to Microsoft to fix.
https://www.yousendit.com/download/THE2b3BORkUrV3lGa1E9PQ. hope this helps its two ebooks on how to repair red light error ,full instution plus pics show u how.this download is only there for 7 days or 100 downloads.DT
FYI. the 3yr extended warranty only applies for the 3RED LIGHTS and E74 issues only..if the console is already in the service center,you dont have to worry anymore,microsoft technicians will surely work hard to get it fixed. just wait 2-3weeks for the whole repair process,and you& your son will enjoy playing xbox in no time. :-)
E73: General Hardware Error: Ethernet port... this error is caused by
a problem with the Ethernet port and, you will have to send this to Microsoft for this repair. The Ethernet port is integrated and is part of the main motherboard. if its malfunctioning, the entire board will have to be replaced.
Call this number for a repair ticket. if you have not opened your X box console and it is not a year old, this repair should be free.
Try this, I saw this on a u-tube vid, and i can't believe it worked. Turn on unit until the red light flashes and the error code(E 73) shows up on the screen. Next insert toothpicks in the back of the console(while unit is running) into the cooling fans, this is to suppose to overheat the console and start two red lights flashing. Turn off console when this happens(unplug all cords from console) and turn the system back on. Like I said it worked for my system and I hope it works for all of yours out there.