A windows 2000 server with all SP, Raid 1 on first 2 drives, and 3 drives on a raid 5. Event log shows unexpected shut down at aproximately the same time. All running events have been shut down that I know of, but since it is still around the same time frame each night, I'm wondering if there is a background event running...Is there a way to log all events in a certain time frame? One vendor is saying it is a HDD failing, but all diagnostics show everything is good. Another is saying it is the raid controller, not sure on that? We did find that in the Bios the USB IRQ was the same as a controller we are using for our tape backup, but in windows there were no IRQ conflicts. So USB has been disabled completely just to make sure there wasn't an IRQ conflict...so those are the steps taken, please throw out suggestions...