I updated an audio driver yesterday, rebooted and the bios decided it would erase the service tag and go into manufacture mode. I can't get it to save the service tag now and I have to force the alt-f for manufacture mode to turn off the fans, but as soon as I reboot, the fans start running and the warning returns about the service tag.
I have reset computer, reflashed bios, etc.. still the same. Dell service wants to replace my motherboard, but I have a fight with them over refurbished vs. new. they said I could ship my computer to Texas and they would fix it, but that is a nonstarter as I use this every day in my business.