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Turns out it was the PSU. I had a spare - but as the original was an old Dell (POS) and they tend to have their MoBos made to their own specifications I will have to try slaving the suspect HD (the...

Thank you.

I think the next step must be to disconnect the PSU from everything inside the PC -drives and the mobo- see if I still have current running through the case. If that is the situation...

I will check the grounding points. Thank you.

I feel a low grade charge running through the case. It is not a static jump. when the power is off the charge is not there. With the power on the charge can be felt on the case. --

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Have a work PC that had not been used for about 2 months. Turned it on got message that hard drive was not found. Opened up PC to check that nothing had become loose or dusty. Replugged in power...