Question PSU or Motherboard error?

[jimmypokemon]

I currently have a prebuilt M32CD Asus computer with some upgrades (Added 4 GB of ram, a 1050ti, and an ssd). However, I went to shut my computer down yesterday and it won't work now. After shutting it down, I tried to turn it back up using the case's power button which lit up the button and the system clearly started. However, there was not video and when I tried to hold down the power button to turn it off (for like 20 seconds which is more than enough), it didn't work. I had to remove the power cable for it to turn off. My theory is the trash 350 watt power supply died or something but does that explain why it powers on but doesn't have video? I tried 2 HDMI cables to both my graphics card and onboard graphics and they both don't work. Another theory would be something wrong with the motherboard. Those 2 are the only culprits I could think of as ram, gpu, and ssd have been removed and tested which didn't do anything. Any help is appreciated.

 

[jimmypokemon]

Also if I turn my computer on, my keyboard and mouse don’t light up at all but things like the ethernet cable light up (maybe software issue).