Yes, it comes with a standard power supply.
Yes, it comes with a standard power supply.
Yes, the motherboard comes with a factory power supply.
No, I haven’t used a modified power supply before.
For question 1, the response is no. For question 2, after realizing the RAM was the main cause, everything appears normal except for a black screen after changing the RAM. The machine runs fine with the modified PSU, but the problem persists, possibly related to the GPU. I’ll need to verify the GPU functionality on another computer.