I searched the archives, and I found the same problem reported by someone
with an XPS 8250 six months ago. He had a wireless mouse and keyboard, and
was assuming that the problem was there. But I have a standard keyboard and
USB mouse, so I would guess that's not the problem. My Video card is an
NVidia GeForce4, with 64 MB RAM. (I wrote to him to see if he solved it,
but so far no answer).
I tried a number of boot options, including "noacip", "vga16:off", "nofb",
"nopcmcia", "noA7xxx...", and just about every other option that I thought
might conceivably be related, to no avail.