No install of ReactOS 0.4 on real hardware

Hi Gang,

I was really hopeful when I saw the announcement, and downloaded the latest
ISO, and tried it on both a Dell Optiplex GX270 (basic P4 machine), as well as
a Dell Optiplex 755 (Core 2 duo).  

The install went fine on both machines, but neither one will boot up.  Locks
up at the first page of loading.  If I did a debug boot, the 755 would try to
start, and I could get into the desktop, but then it flaked out.

I would think these boxes are fairly mature technology, and should be no
issue, but apparently not.  Is there a way I can help to debug and get this
working?

Thanks,

Bob