A full clean install would remove any system problems so there is some hardware going bad I suspect. In your BIOS what voltages are listed for your PSU? There should be a listing for 3.3V, 5V, and 12V and should be within ±5% of those values.
Did you use the HDD makers diagnostic tool?
did you test each DIMM separately in different slots?
To help all of us would you please add your systems specs? Here's how: System Info - See Your System Specs
Under System Manufacturer/Model Number
add desktop or laptop and whether self built.
You can easily copy/paste from within the app, no install required.