The computer is cut down, what's the problem?

Question

Iron

Hello everyone, 4 months. I assembled it back with a new system unit, everything is new. It worked properly now, such a problem began, it just works and is cut down, and the power button on the case remains lit, it starts to turn on after you move the system unit ... The bad contact disappears, I kept poking so hard that I couldn’t connect badly.
It started with the fact that a spider got into the PSU and burned out, after that I changed the PSU and the usb 3.0 on the front panel also burned out, I stuck it out and everything, everything seemed to work, and now it is cut down.
The kanders on the mother seem to look normal, not swollen ....
What is it? What am I supposed to do?
If anyone knows please tell me.

Answer 1

> 4 months I assembled it back with a new system unit, everything is new
Due to the fact that it is better to take everything new to the SC under warranty.