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What problem are you having exactly?
Those boxes are UEFI meaning they will boot without a hard drive so no detectable power to the drive should not be an issue.
You should get grey screen and a flashing question mark.
Alternately you can try booting single user or verbose mode. hit power on then Command-S or Command-V.
The 5V is just a trigger / pulse signal to tell the drive to spin up. It's hit or miss to pick it up with a volt meter, at least I've found it to be a pain in the ass to detect reliably.
The hard drive gets it's power from the MB, specifically that cable covering the diagnostic LED's in my second pic.
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