Hi, Scott.
I wouldn't call them "horror stories", but there's more involved than most
people think about at first.
The motherboard and CPU are the heart and brain of a computer, and switching
to a new set is much like a heart and brain transplant for a human - except
that the body of the computer can survive.
But when the computer is powered up again, WinXP can't find its hard drive,
its RAM, or anything else. When it was installed originally, Setup detected
the hardware configuration and customized YOUR copy of WinXP to fit that
configuration. Now that you've made such a fundamental change in the
hardware, you need to let it detect the new environment so that it knows
that the gearshift is now on the steering column, rather than on the floor,
to use an automobile analogy.
Unfortunately, unless your new mobo/CPU are almost identical to your old set
(and you wouldn't upgrade if there weren't some significant differences,
right?), you will need to run Setup again - which means to reinstall WinXP
from scratch. At least, you can preserve your installed applications and
data and most of your tweaks by doing an "in-place upgrade", as described by
Microsoft here:
How to Perform an In-Place Upgrade (Reinstallation) of Windows XP
http://support.microsoft.com/default.aspx?scid=KB;en-us;q315341
This will take about as long as a clean install, and you will need to visit
Windows Update - as soon as you get your firewall and antivirus in place and
get back online - to get the latest Service Pack and later fixes. Even with
broadband, the whole process (including SP1) took me half a day the last
time I had to do it.
But I wouldn't call it a horror story - so long as you know what to expect.
It's just another step in the mobo upgrade process.
RC