Two PS4s not turning on. Not sure if need power supply or...?

I have two PS4's I brought online as faulty hoping to try and fix them up. One of them, when you turn it on, it quickly has the blue light and turns off.Model number is CUH-1202A

The other, it doesn't turn on at all, no sort of lights, no beeps, nothing. However the eject button makes I think 3 beeps when you press it. Model number is CUH-1002A.

I have no matching power supplies to test if that is the problem, but how can I tell if it is the power supply, or if something else is wrong?? The one that doesn't turn on at all, the seller I got it from said something about the HDMI not working. Would it be more likely the HDMI port needs replacing rater than the power supply (or something else??The one that quickly powers on was the most dustiest inside of anything I have literally ever seen. Could of all that dust heated up something inside? Possibly destroyed the motherboard?

Pretty much, is there any actual way to tell without buying new parts to replace first if any of that fixes the problem?

Thanks :)

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