Desktop problems

I had a desktop that was in a constant boot loop so I decided to switch the motherboard with another. So now I have 2 desktops that have problems the first one when I hooked it up I get the fans to spin and when I plugged in the vga no output I have no idea what's going on.

The second never turned on but the green light on the board used to come on and now nothing and when I try the switch it makes like squeal of somesort I don't know what is going on I might have hooked it up wrong and did some damage? I don't know both desktops are really old I was thinking of buying an new one cheap one(these are my parents computers) get back to me soon
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More about desktop problems
  1. Hi, Try swapping the power supplies and test the one that never turned on.
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