Nintendo switch only starting up when joy cons are connected

Nintendo Questions Nintendo Switch
1

The Switch only switches on after the left joy con is connected. After that it works perfectly.

2

Hello

This is definitely something special. Could you disconnect the left and right rail ribbon cable and see if it turns on?

3

I disconnected both ribbon cables. It doesn’t switch on. I reconnected the cables and connected the joy cons. It doesn’t switch on. When I disconnect the battery and reattach it, it switches on. The joy cons can now be disconnected and the switch plays as normal.

4

remove all joycon rail cables,turn on switch and connect to PC see if it’s in RCM mode

5

Sorry jkyoho, I’m not very good with software. I have absolutely no idea of how to see if it’s in RCM mode. Is there a programme I have to install?

6

download TEGRARCMGUI from this link run the exe and see if your device on RCM all the time
https://github.com/eliboa/TegraRcmGUI/releases

7

It’s saying "no RCM connected

8

you mean you charged you device and connected usb cable to PC and pressed power button?

9

Yes that’s correct…