Just one that I worked on today.
Duron system, 256Mb winodws XP. etc bog standard.
Doesnt shutdown, say windows is shutting down, plays the sound finishes writing files and stay's like that.
When booted in safe mode it does shutdown.
Booted with all services off and no win.ini, system.ini loaded. Still wont shutdown.
Used the direct shutdown command, that shut's down all users etc (for network servers usually). still no affect.
I installed SP2 just incase that could solve it, but alas it did not.
Didn't have time to investigate further.
Intel Core2Duo 6400 @ 3.4Ghz
4GB Geil 6400 Ultra
3 x 500 Gb Samsung HD
EVGA 8800 Ultra OC