I have been trying to install OMV4 for a couple of days and it has been impossible for me. Let me tell you:
My nas has an intel d525mw board. I have installed OMV4 in a sd card. The installation is correct, but once I connect the 4 hard drives that I have (2 to the native SATA ports of the board and 2 to a PCI card), after going through the screen of the grub, the pc remains dead and does nothing, just black screen.
I've tried with several SATA cables, with another power supply, changing the order of the disks ... and there's no way. With 3 connected disks, it boots perfectly. If I connect the 4, it does not start. I've gone mad.
In the end, I tried again to install OMV3,in case it was a problem to install it on the sd card (I previously had installed it in another HD), and that was not the reason, since everything works perfectly.
Do you know where the problem may come from? I'm disappointing not to be able to use OMV4 and have to stay in 3.
It's not a problem with the SATA cables.
The power supply is not a problem.
It's not a problem with hard drives.
With 3 discs works (whichever they are), with 4 does not.
In OMV3 the 4 work, in OMV4 no.
I do not know what else to try.