7.1.2 installer hangs on boot

[Fekete Zoltán <fekete.zoltan%minux.hu@localhost>]

Hi There,

I want to install NetBSD 7.1.2 amd64.
Install media is an USB stick.
Installer boot loader can see the dev as hd0a.

When booting the kernel it stops at root:
and shows an odd cursor (blinking pell-mell and no input is echoing).

If I press acpi button, then NetBSD shows the normal halt messages and 
powers off as expected.

As an addition, the line before root is:
boot: <unknown>


Could anybody see/solve this before?


Thank you,

FeZ