Thanks Brian. I found a precise 1 to 1 match for the PCB, from hdd-parts.com.
The pc is some kind of crazy confabulation, It's a workstation and all the usb and monitor cables go through a hole in wall to the table next door, so to check HDD's i have to walk into other room and crouch next to wall...it was early in morning and 2 HDD's were missing upon reboot, i think a flash drive on usb was blocking them from BIOS, i missed it. both disks are on same power cable so i checked the molexes and SATA cables 5-7 times, crouching and walking back to fiddle with BIOS settings and being dizzy and frustrated at 7.30 AM.
I plugged in the molex that i had disconnected, and the PC was on, except it's become low noise lately! DAM.... the molex Y connector has no protection from touching pins if you try to plug molex backwards, so i figure i touched 12v to 5v pin and ground to ground for a millisecond, the pc switched off, drives are silent. backup and main drive.
I will check the TVS diodes on the drive for over voltage with a multimeter.
I have 40 days since last backup of my flying game with finely tuned physics programming and 40 3d geodes and crystals 3d files for making procedural things with. my game lol