Solve : Installed two additional HDDs and none of my drives are detect

1.	Solve : Installed two additional HDDs and none of my drives are detected in bios anymore?
Answer» That is probably the worst POSSIBLE outcome to find all those drives have failed. Remember that the drives do have their control circuitry on-board. I'd suspect that perhaps it was the logic board that may have been fried by excess power, but the motors are more resilient and still operate AFTERWARDS. Optical drive might have just gotten lucky (MAYBE it was on a different PSU Rail?).You should have in your tool box a basic VOM or Digital Voltmeter. You need ONE to validate the output of the power supply. Were the hard drives ruined?

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