Xbox 360 Controller Not Connecting / Sync Issues - Top 25 Tips Guide!

EXPAND THIS  DESCRIPTION FOR A LIST OF REASONS... 
1. Always Power On your XBox with the X button on the controller! 
2. RF Channel Interference - press the two 'communication' buttons (controller and xbox front panel) together, try this at least x3 times to test the alternative RF channel frequencies
3. Controller Battery Pack failure - replace battery pack
4. Metal objects near Sensor area - remove to fix
5. USB devices draining power - remove to fix
6. Sensor Cover Dirty - clean with soft cloth and polish
7. DVD Drive causing Earthing problems - eject DVD drive, waggle, insert a different game, close DVD drive
8. Washing Machines, Microwaves, Mobiles, Wi-Fi, Ipads - switch off and remove
9. Kinks or Coils in Wired leads- straighten all leads
10. Front USB ports not working for controller - use rear USB port
11. Dirt Inside Sensor Bay - remove front cover and blow strongly into the hole
12. Controller too far away - bring closer to Sensor, try with front cover off
13. Front Edge Earthing Problem - apply pressure to top and bottom on front of unit
14. Leads not connected securely - push in all leads
15. HDD causing RF or Earthing probs - push HDD,remove cover, remove HDD
16. Plastic sides causing earthing connection problems - remove plasic sides
17. Shielding Plates not earthing correctly - bridge shielding plates with a wire
18. Front Circuit Board Dry Joints - pull forward, use pencil eraser to fix
19. Sensor Face Dirty - use a lint-free cloth, blow away dust
20. Sensor or Caps faulty - push down all caps, replace if necessary
21. Shielding Plate Screws not perfect - remove some screws, quarter turn loose. 
22. Lower Plastic Housing causing issues - remove lower plastic housing
23. Unknown reasons - some machines like to be on their sides!
24. Unknown reasons - some machines like to be upside-down!
25. Faulty Controller - replace with new one (usually never the problem!)

Ok, so you've tried everything else, now try these - in order - and something will eventually work. Pin down the issue and then correct it. Sometimes one trick will work for six months or so, like Bridging the Shielding Plates, or ejecting the DVD drive on boot, so it is important to find the solution which works for you and your machine independently.  As said above, always turn on your machine with the 'X' button on the controller, so that the link to your machine is established during Power-On. If the machine responds to the 'X' button but still fails to connect, at least you know the wired/wireless system is working and that the machine is not connecting for a different reason. Most of the time, maybe 70%, I'd say Earthing or Shielding are the two main issues, so sometimes pushing the xbox in various places might have an effect.  

It has taken me two years to find all the issues which were causing my machine to drop the signal - and I know it is late in the 360 life-cycle, so please forgive the lateness of this video. Hope it helps someone. :) 
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