SOURCE: Xbox 360 Pro System A/V Port
It is a problem with the Graphics chip[ on the main board.
We can repair it for you.
James
www.fixmyconsole.co.uk
SOURCE: xbox 360 doesnt work because of one red light and message of E73 that they dont know how to fix
E73: I/O Hardware Error - Couldn't calibrate HSIO Bus from edram: this error is likely caused by a problem with the Ethernet port or supporting control devices.
You can try to find some parts online, but it looks like your Ethernet port is bad...
SOURCE: XBOX 360 1 red ring E73 easy fix?
try unplugging and restarting if that doesn't work go into the configuration from the applications and check/adjust settings
SOURCE: e47
go to this website "http://www.llamma.com/xbox360/repair/Xbox-360-error-codes.htm" and read through the page and try find your hidden error code it will be more specific with your problem also that type of error has been added to microsofts warranty plan so you may be able to get it under warranty
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