Computer takes long to boot, then works fine

Hey,
I recently moved all the components of a friend's case into a Thermaltake Armor jr.

Now, when I start it up, the black post screen shows, then it shows black screen for a minute or so, and then windows loads normally.

The boot order is set to the windows HD first (there is only 1 hd)
Everything else on the computer (actual windows start up, all applications, etc.. ) all work fine.

E4400
2GB DDR2 6400 Ram
Windows XP SP2
80gb 7200RPM hard drive

Anyone have any ideas?

Thanks!