I just picked up a HP Z620 from Ebay and the power supply is quietly cracking. I put my ear up to the PSU and it's definitely that.
I'm not sure if I should send it back and hope to get a better one from the IT resser? I guess it's an end of lease workstation. I'm defitnitely not sure about leaving it switched on and working while I'm away.
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For laptops or desktop PCs, use the Fn+Esc keystroke while logged into Windows to locate the Product number (SKU)
Also are these new PSU's a better option than an original HP 623194-001, or updated HP 717019-001 in my Z620?
You will need to get a ATX to 18 pin adapter to use those ATX power supplies. There is also the question of physical compatibility in the case - they fit in the Z420 but Z620 has a different style PSU.