Check for resin leaks.
1: Remove the U disk, restart the machine, and check whether the U disk is inserted into the machine and causes no response when starting the U disk normally (the U disk is short-circuited, the non-original U disk and the large memory U disk cause the machine to fail to boot normally). FAT32bit formatting is required USB2.0 series USB drive within 32GB
Still can't boot, continue checking the adapter
2: Check whether the adapter has the correct 24V stable output. You can try other 24 or 12V adapters (continue checking normally, if the voltage fluctuates and is lower than 24V, change the adapter)
The adapter is normal and cannot be turned on
3: Open the cover and reinstall the internal motherboard and display wiring. There is improvement. The problem is solved. The wiring is loose and the contact is poor.
No improvement. Check whether the motherboard indicator light is on during power-on state. The motherboard indicator light is on. Problems with the display and cable arrangement.
The motherboard indicator light does not light up. Remove all the wiring gradually. Does it light up? It lights up. There is a short circuit in an accessory or the motherboard (if it is plugged in and it does not light up, there is a short circuit).
Not lit. Still not lit. Send the motherboard.