Okay got my XPS 420 last Wednesday. Quad-9450, 4 gigs, ATi 3870, 750 HD, onboard sound, 24" monitor.

 

1.) Audio slow down/screech of death/low end blat/spinup-whirr/stops working. Disabled onboard sound and drivers, uninstall Creative software, install M-Audio Audiophile 192 in bottom PCI slot.  Still doing it. Move up 1 PCI slot a little better but still doing it.

 

2.) Disable miniview in BIOS, but it still worked.

 

3.) Disable onboard NIC in BIOS, I use wireless. A-HA MINIVIEW TURNED OFF!!!!

 

4.) Front USB ports reporting as NOT being UBS 2.0.

 

Will be contacting Tech Support today. Way to many things not right for me to keep this system.