Lenovo fan error is very common with Lenovo T60, T61, T400, and T410.

The Fan error is cause due to the fan got stuck and unable to spin causing system to produce the fan error and fail to boot.

How to fix when the Fan not spinning and giving fan error.
Blow the fan with compressed air to see if you can free the fan.

Fan might be out of place from dropping.
Snap it back by pressing down on the fan.

Fan is dead, won’t spin at all
Replace the fan

The Lenovo fan error applies to Lenovo, T60, T61, T400, T410, and many other models.