The USB ports on my D600 died - don't know why - but decided to get another motherboard. So I found one on eBay from an outfit called red_planet_motherboards. The board is supposed to be manufacturer refurbished. However, when I installed it in my laptop, I get a "No bootable devices" error, regardless of what hard drive or bootable CD I put into it. In looking at the BIOS settings, I find that there is no service tag or asset tag information entered. My question is: Does not having a service tag keep the computer from booting?