After some clever gamers figured out how to make the 40gb PS3 run a fan test, it seems someone else has found a way to make the 60gb PS3 run one too. See here in this tutorial.
We would like to say that this is not recommended, and that it is unknown whether this will cause damage to your PS3. We extremely advise you not to do this if your PS3 is under warranty.
Update: It has been found that this could cause damage to your PS3 and it is recommended that you must not do this. A link is provided below.