If you hit ESCAPE after the 2 Fan Error beeps, it will boot normally (without fan service)
Power-cycle battery: “With the computer already shut down, unplug the power cord from your system. Remove the battery and wait 30 seconds. Re-insert the battery, and re-plug the power cord. Power on the ThinkPad again to see if the “FAN ERROR” error is gone.
Make sure all the print cartridges are seated correctly.
Inspect each cartridge for broken parts. if so replace the cartridge
Inspect each cartridge lock-lever (on the right side). Open the front door and remove all cartridges and the ETB. Then use the ETB holder on the right side to move the lock-levers up and down. Replace the cartridge lock if it is broken.
Inspect the right side cam. This piece controls the movement of the cartridge engagement arm, the cartridge shutters, and the OPC drive. You can inspect this piece without taking off the covers by wiggling the white rod arm on the right side of the ETB. If it moves easily, the part is broken and should be replaced.
Inspect the ribbon cables. Folded or damaged ribbon cables can cause a short that generates an error.
Inspect the cartridge guide rails to see if any are damaged.
Upgrade the DC controller firmware.
Clean the contacts on the memory controller PCA.
On the DC controller, make sure that connections are seated correctly.
On the driver PCA, make sure that connections are seated correctly.
Check the gears on the print-cartridge drive motors. Replace defective motors.
For releases of MATLAB prior to R2012b, MATLAB used ‘X11’ as it’s primary Windowing System, which has since been replaced by XQuartz. As a result, whether you did an upgrade on top of your existing OS X or if you did a clean installation you will need to reinstall XQuartz for MATLAB R2012a and below. XQuartz can be downloaded from here: http://xquartz.macosforge.org/landing/