Two HF2-SU3S2 units, 1 doesn't power up the drives now

[jriggins]

Bought Two HF2-SU3S2 units at the same time. Unboxed them last weekend. Hooked up via eSata to a RocketRAID 642L (supports port multiplier) running Windows Server 2016.
Single RAID-5 array configured across all 8 drives.
Initially it hooked up and ran fine. Was able to access the RAID volume and transferred data to the drives for about 20 minutes. Then, the second unit powered off. Now it doesn't power up correctly - never seems to initialize the drives at all.
Swapped eSata cables around and reseated all the HDDs.
Video of exactly what is happening: https://youtu.be/__O9U6hIQaQ

Not sure what else to try...any thoughts?

[Admin_Mediasonic]

Don't think your esata card is working properly
the 2nd box turned off, because it did not detect a computer. The "e" icon (eSata connection icon) on left of front panel, didn't light up.
the top box did light up (that is why didn't turn off)

try switching to USB and see if you can access the a hard drive ( spare hard drive)

[jriggins]

Plugged the second unit in via USB and powered it up. Switched Interface Mode to 2, but it still behaves the same.

[Admin_Mediasonic]

Plugged the second unit in via USB and powered it up. Switched Interface Mode to 2, but it still behaves the same.

did you use a spare drive??
cause USB won't work with Raid 5 or any Raid you created from eSata

[jriggins]

(with the USB connection) Shouldn't it still power up the drives, present them to the operating system and allow me to reformat them?