I just bought a new Raspberry Pi 3B+ UK and was working with it for about 2 hours, and then when I was not at home, my son noticed that the CPU is hot and tried to cool it down with a normal 5V PC fan by connecting the wires to the GPIO, and suddenly the raspberry shuts down (I think he had connected the wires wrong).
I want to turn it on but only the PWR light turns on and doesn't flash.
I have tested the SD card on other Raspberry Pi Imand it works.
Any ideas? Can I repair it?