First time I boot up this brand new out of the box X51, I get a PCU Fan Failure Alert. First time I ever get an alert after buying 37 PCs, laptops or servers all from Dell. I guess always a first.
I contatced tech suppor and they confirmed this X51 was overheating, fan wasn't working. I removed the left panel (after powering down and disconnecting power cord) and found a loose screw lodged in the fan blocking it. I disloged the screw, put the panel back on, powered back up and this little blue alien is now smiling at me!