I built a new rig and wanted the 850watt power supply that was running my old computer to power the new set up. I put an older PSU into the old system to get the data off of it that I wanted (going from RAID to AHCI and afaik you can't just plug a raid drive into a AHCI system and have it work.) Upon hooking up the old system to begin the data transfer; it fried the PCBs on 2 of the 3 mechanical drives. So I got a newer, different PSU, replacement PCBs and did a rom chip swap; plugged in the stand alone drive and sparks and a puff of smoke later; another dead PCB. And I can not figure out what is happening or why it's doing this.
Old computer - Ran perfectly fine
3930K
2 1TB SSDs - Raid 0
2 1TB Mechanical HDDs - Raid 0 (bottom picture)
1 1.5TB Mechanical HDD - Standalone storage (top picture, top PCB is original, bottom is replacement)
850 watt PSU
GTX 970
Changed the 850 PSU to a 750 and the 970 to a GTX 950 and it fried the first boards. Further changed the 750 to a 1000watt PSU and fried the 3rd.
For what happens: Plug in hard drives, hit the power button, HDD power connector sparks and system auto shuts down.
If anyone has any ideas as to why my system has decided to fry these PCBs on the regular; I'm all ears. Would like to figure this out before I replace the RAID PCBs and risk more drives.