The motherboard is not working, I want to know what is the problem?

Question

Computers

The thing is, I bought a molex adapter to 6pin and
put the cpu 4pin into the power supply (yes, I’m not a very smart person), the adapter started to burn, turned it off after about a second, the next time I turned it on, the picture first appeared, and then disappeared, after the second attempt, the inclusion did not turn on completely
changed the battery did not help
changed the power supply also did not help

is it possible that this is because of the processor?
the fans do not spin
visually, it didn’t seem to burn out , I
changed the RAM, it didn’t help either