Hard Power Cycle: Hold Power button 10s → Unplug power brick → Wait 60s → Replug → Power on.
Remove All USB Devices: Drives, controllers (wireless dongle), Kinect, headsets. Boot bare.
Eject Disc: Stuck disc motor can hang boot.
Try Composite (AV) Cable: Rule out HDMI handshake. Switch TV input.
Dashboard Corruption Fixes
Clear System Cache: Settings → System → Storage → Highlight HDD → Y → Clear System Cache. (If dashboard loads).
Offline Profile: Sign out → Create Local Profile → Test. Corrupt cloud profile?
Dashboard Update via USB: If error code (E71, E74, etc.): Download Offline System Update (OSU1) from Xbox Support → USB (NTFS, root) → Boot with Bind+Eject+Power.
Hardware Failure Signs (Red Ring / Error Codes)
Red Ring (RRoD): 1 Red = Overheat / 3 Red = General Hardware / 4 Red = AV Cable.
Xbox 360 is vintage. Repair cost > value (except Jasper 250GB/4GB Slim). Migrate saves: USB drive → PC (Xplorer360) → New 360 / Xbox One/Series (Backward Compat). Play Digital versions on modern Xbox.