Question My MotherBoard Wont Turn On!

Oct 22, 2020
my MSI z370 Pro
Died after i connected a used bought SilverStone PSU (750 Watt) Silver rating (I know i made a biggest problem buying a used psu)
the Guy wont agree to return the psu nor agree that his psu is faulty ... so short story he was a scammer
as soon as i connected the psu my sades k14 keyboard had a spark and it died
and no smell or anything on my mobo.
i took to like 5 repairing shops and they all even refuse to see whats the problem in it and says no one here in country fix mobos just go buy a new one
i saw this video on youtube and figure out the chip near my gpu slots is heating up which is making the mobo wont turn on .
if anyone can help further or is it no use its a trash item ?