Question Pc power works then foesnt then works again. Can there be an intermittent power supply problem?

Jan 24, 2020
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New pc. Worked fine for a few weeks. Then no power at all. Just a faint buzzing from the PSU. Took it back to where I purchased it. They plugged it in and it came on right away! Anyway. They checked all the connections and I took it home again. Plugged it in and it didn't work.
Took it back and this time it didn't work in the shop either. They checked it and decided it was a faulty on/off switch on the case. So they replaced the case for a new one.
Got it home and..........it didn't work!
They are confused and so am I.
We are now to take it back again and they say they will replace the PSU.
Has anyone else had this kind of problem?
Can the PSU be intermittently faulty??.
 

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