SOMEONE PLEASE HELP ME! I have a problem with my Prusa i3 mk2s Printer.

SOMEONE PLEASE HELP ME! I have a problem with my Prusa i3 mk2s Printer.
I updated my i3 mk2s printer to the prusa i3 mk2.5 printer. I did everything correctly and followed the manuals online but when I turn my printer on I hear a loud beeping noise, and fan turns on and the probe light turns on. I contacted the people at prusa and they said the noise was from a bad wire and to the refer to the manual. I did and I found nothing on bad wires.

I don’t know what to do.

PLEASE HELP

Does your LCD screen work? Has it spit out an error value at all? Fan on seems like a thermistor wire.

Disconnect all, and start to reconnect one at a time. Start with just the LCD cables and nothing else. Just turn on to see if it works, turn off, connect next cable and test again. If it stops working with one specific cable, at least you have an idea where to look for the problem.

@ThantiK my LCD does work. It has not said any errors on the screen either. The thermistor wire is the blue right? Thank you.

@jochen_vleugels I will do that. Thank you.