PF sense amd64 hangs at install

[StefaanC]

Weird

Pfsense was running fine for a week or two, but suddenly, DNS IP's suddenly not receivable by DHCP.
Even using fixed IP's and DNS, no internet connection.

So as test I hooked up a laptop directly to the modem and yes, worked without any problems.

Next stap was chacking the harddrive well a 120GB SSD but no errors.

So, re-install but all re-install's fails.
The kernel loads but get's stuck at: Trying to mount root from ufs:/dev/ufs/pfSense [ro]…
And under that, a character square block

The router is just a small computer based on a dual core intel atom 2ghz hyper threading , 2GB ram 6 1gbps ports.

Any ideas?

[StefaanC]

About the system:

ACPI on, AHCI on, legacy boot off.

The unit has two USB2.0 ports , both tested.

The USB stick could install Linux mint fine on a computer so I doubt that the usb stick is the problem.
PFsense hangs now approx 12 hours since latest attempt.

Wait will test legacy on, hci off etc.

[StefaanC]

Turning on legacy mode en the setup goes one step further
I choose single user, kernel loads

And oh, boot is going one step further : Enter full path name of shell or RETURN for /bin/sh:
So I press enter : system hangs.  I type /bin/sh: <enter>Then an error : init: can't exec /bin/sh: for single user : no such file or directory.

So I rebooted for the (forgot how many times but this time I did choose Multiple users and what a surprise, setup continues to the "graphical" setup.

So case solved. Still weird that single user setup fails.</enter>