I had an E74 error on my 360 with 1 red light, i did the x-clamp replacement as i have for loads of people in the past,
and when i re-connected it i now have 3 red lights, oh lucky me its just my luck

The problem is when i switched it on the fans operate for a matter of a few seconds then stop and the power brick turns orange but the 3 red lights still flash, i have not seen it do this before so does anybody please have any ideas how i can cure it ???
regards
Stan.