my name lokman from bangladesh brother if my answere you get helpfull u can pray for me
soloution
1, you see mainboard have two power suply one is 20 or 24 pin secend one is 4 pin at first you open the proccesore cooling fan and than cheq proccesore heating normaly if proccesore not hot plz change electrolitic capacitore you can see this capacitore with 4 pin power suply after that if no display you can change mosfet tranjistore you can see with 4 pin power suply after that cheq your proccesore heat normaly that means your pc is ok