acer Aspire TC-780 Pc on, all components running, black screen.

Hello, it's been 4 months or more that i got this problem.

A day, my computer crashed and shutted off, and when i turned it on, there was a black screen.

1 Year ago, i bought 2x8gb 2666mhz ram for my acer Aspire TC-780 that had 8gb 2133mhz of ram, and was working perfectly.

Sometimes, i had to remove ram, turn on the pc(continouos beep), and put the ram back in, it shutted off automaticallt, and when it rebooted was working perfectly.

Now, when i do the same thing, doesn't work, it reboots few times, but no signal. Power led off too. I changed CMOS battery too.

Also, i bought a new graphics card(GTX 1080 Ti) and a new 550w psu because the gt 730 and 220w psu wasn't enough for the games i play.

I made a mistake too, i broke a socket pin by cleaning the thermal paste. I think it's a VCC pin(lga 1151 skylake i5 6400). Idk if that is the main problem.

Another thing, when i put my old stick of 4gb ram, it worked without no problem, but now the ram broke.

Can someone help? Thanks!

[Edited the thread to add model name to the title]