If your laptop is constantly running, dust can accumulate and cause your laptop to overheat and lock up. Place a piece of cloth or towel to lay the laptop down on, or some place where you won't mind dust spreading. Make sure that the laptop is completely shut off. Just need to simply remove the back cover of the laptop. Locate the fan and use a can of compressed air on the fan to get all the dust and debris off of it. Be sure to not spray to strong with the can as this can damage the fan. Hope this helps.