building pc I Need Help

[FoxxVr]

Okay, so 2 years ago I bought a Pre-built Hp Computer.
Made for gaming the specs included
Cpu: intel i5-7400  - legit actual thing
Gpu: Hp Low Profile Gtx 1060 3gb
Ram: 2x4 gb 2400 mhz ddr4 by hp
an off brand psu (500w) by hp
and a 1 tb hdd - most likely legit :/

 

 

I broke it with a cup of accidentally spilt water, I tried fixing it.

 

Didnt work.

I then bought parts to replace what i seemed was broken

 

This being a new psu: evga 600w bronze and a new
Mobo: was a z237 now a Asrock b365 Phantom Gaming 4 (I tried using the cpu with a mobo that supported it but the cpu was dead)
I then replaced the cpu (this is the time i got the asrock b365 phantom gaming 4)

 

i now have an i5-9400f
still no boot, mobo had light that stayed on dram so i bought more (its prebuilt dram and after watching enough of linus's videos i learned that ram can be altered by manufactures when in a prebuilt system)

i now have 2x8gb corsair vengence 3000mhz ram

It turns on but with no display, this leaves me to believe the gpu is dead

 

can manufactures alter a gpu like they do ram?
and can they alter the hdd too?