Hi,

Optiplex 7000 Tower with PSU 329-BGNR : 500 W internal power supply unit (PSU), 92% Efficient, 80 Plus Platinum, running Windows 10 22H2, all Windows and Dell updates applied

When I walk away from the PC and it goes to sleep, it (I presume the power supply) makes clicking noises periodically.

And it won't wake up when I press a key on the (wired) keyboard, it just sits there and makes clicking noises.

I have to press the power button to wake it up.

What is the problem, and how to go about troubleshooting this, as virtually every other PC I've owned wakes up when you press a key?

Thanks