First of all, plugging them in while power is on could result in damage to the RAM. Secondly, doing any work on a laptop while power is applied could result in a damaging spark. Remove the battery. Disconnect any other cabling to the laptop, including an Ethernet cable or a telephone modem wire.If the laptop has been running recently, allow it to cool for about 15 minutes; memory modules can become quite hot when they are in use. Locate a small Phillips-head screwdriver.irst of all, plugging them in while power is on could result in damage to the RAM. Secondly, doing any work on a laptop while power is applied could result in a damaging spark. Remove the battery. Disconnect any other cabling to the laptop, including an Ethernet cable or a telephone modem wire.