Ender 3 v2 Bed not heating tired to replace motherboard and bed but still not working

I have a Ender 3 v2 it orignallay had the 2.7 motherboard

I had an issue with the hotend and had to replace everything due to damage to the cable.

I got it up and running and after 5-6 prints the bed had a thermal runnout error.

I tried a few things undoing the hotend to see if that was the issue. I checked the connections nothign worked.

I bought a new bed and it did the same thing it won’t get above room temp.

So I returned the bed and bought a silent motherboard.

Ive installed everything corretly and updated the firmware and its still doing it

Im at a loss as to what is the problem is. Could it be the power supply is bad?

Im really thinking of returing everything and scaping this thing becuase I can’t figure it out. Any ideas?