When you press the power button, the laptop turns on, a picture appears with the words Dell and immediately turns off. First of all, I flashed the BIOS from the off site,and replace the io chip I measured everything on the drosels, everything is normal, I also checked the on button. Disconnected the entire periphery, changed the RAM too,without RAM, the laptop does not turn off, on usb outputs it seems everything is all right. Tell me, can anyone come across such a problem ????

Check work temperature and consumption.

Temperature very normal
Power consumption 0.500amps