I’m having trouble with the computer I built. I used it a bit

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I’m having trouble with the computer I built. I used it a bit one morning, shut it down, and when I came back in the evening it wouldn’t turn on anymore. I don’t know what happened to it but suspect a power surge.

I replaced the power supply which fixed that problem but revealed another one; turning it on set the fans going but nothing would display on the screen.

Using another computer I was able to test the screen, and it’s OK. I was also able to stick the video card from my machine into this one and it booted up fine and displayed. I was also able to hook up the hard drive from my machine and access files but several testing programs reported potentially serious problems with the drive, so I got a new one.

I got a POST tester card which gave a code relating to the processor but since I read that the motherboard is much more likely to fail than the processor I replaced that but nothing changed.

So I got a new processor but again, nothing changed. I’ve tried hooking up the new drive and the old one and swapping out the RAM chips but nothing changes.

So many parts are new from when the problem began that I’m at a loss. What am I missing here?

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