This a technical assistance for Lenovo technicians I had the same error with the t410s i5 but I managed to bypass it u will have to go in steps 1 open the machine 2 get any compatible face in volume 3 if it's a 4 or 3 terminal fan it will have the following 2 pair of wires will be for dc supply 5v,or 0.5A the rest of the remaining wires will be for the sensor 4 u will have to locate for 5v low current on the laptop board and the easiest place is the 1st right is terminal to ground 5 solder the dc pair wires on to point have told u 6 u are good to go enter bios by placing f2 go to usb always on disable it option 7 save and restart is will show fan error BUT place ESCAPE the machine will boot and work at max performance 8 visit my fbpage boy technologies for any questions and queries