Please Id and help with these PSU componets

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longshot21771

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These were taken out of a Dell Desktop power supply, obliviously couple of them are fried. What are they all called and how do I go about testing them. The black square one test like a diode on the 2 legs but not on the other. The other blue pieces I have no clue at all. Thanks ahead of time.
 

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The blue pieces, etc are MOVs. What value I can't say, but we could guess if we knew your line voltage where you live.
The black square one is probably a power FET, but it's hard to say for certain as I can't see the entire part number on it.
 
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