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3 hard drives dying in a desktop within a couple months... power supply issue?

We have a dell optiplex 390, shipped in June 2012. So 5 1/2 years old.

In June 2017 the OEM hard drive failed - not spinning at all.
Put in a couple / few year old hard drive that we had lying around.  Restored from backup.
Blew out accumulated dust (which wasn't much)

October 2017 - that hard drive failed. Not spinning at all.
Put in another couple year old hard drive

Used a couple year old digital power tester like this:
https://www.amazon.com/dp/B00Q8SUYHW/ref=asc_df_B00Q8SUYHW5223423
and power tested good per this:

https://www.lifewire.com/power-supply-voltage-tolerances-2624583

Within a couple weeks - that 3rd hard drive failed -  put your ear to the drive, you hear it spin up for a couple seconds then silent whenever power is supplied.

Change out the original oem power supply? walk away from this?  thoughts?

the 3 drives were seagate and western digital (not fly by night brand).

yeah all 3 were not new when they died but I checked smart settings with crysttal disk info on the 2 replacement drives before putting them in. I forget the number of hours the app said they had been running.

I;ve taken the failed drives and connected to other power supplies - same thing - no sound or on the 3rd, it spins for a second then shuts down.
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thanks.  didn't mention a bit more of my thinking - took it out of service because of this.  it's an i3 so OK to use as a kick around / lab computer if it doesn't routinely burn out hard drives.

I have an old ATX power supply so I put that in and we'll see how it works out.

thanks!