E74, 1 flashing red light
The E74 fault is also a common Xbox 360 fault. I have repaired a lot of Xbox 360’s that have had this fault. People say the the main cause is the ANA/HANA chip but other say not. All the ones I have repaired have not had a problem with the ANA/HANA chip, it has been down to the GPU yet again, It is sometimes dry/cold solder underneath the GPU but usually, E74 is a failing GPU.