You do understand that SP1 is beta software, right? You do understand that
installing a beta operating system service pack on a production machine is
A Bad Thing, right? OK, with that said - is there any writing on the "blue
screen"? If there isn't, then obviously the video driver isn't compatible
with the *beta* SP1 and you should simply wait until it comes out for real
and Dell has updated drivers for your laptop and possibly any special
instructions you need to do in preparation for SP1. If you hosed your
computer by installing this *beta* service pack, simply do a clean install
of Windows now. Because you were prepared to do this since you didn't
install a *beta* operating system service pack on a primary machine.
Right?