New PC Build - No power for first few minutes

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Guest

Guest
I have just been putting together my new computer and have observed something strange about the PSU.

If I unplug it for a few hours then go to switch it on, it takes about 10-15 minutes for the PSU to actually start putting any power out. When it starts working, then I can switch it on/off and plug/unplug it at will and it works straight away, but leave it for a few hours and it takes 10-15 for the PSU to start working again. It's as if the PSU needs to warm up or something.

Does anyone have any ideas? Is it a problem with the PSU or could it be something to do with how I have wired it up?

Thanks in advance.