The power switch on my Toshiba Satellite P855-S5200 laptop will not work most of the time, thus I am leaving the laptop on all of the time. I see that a replacement part is available for sale on ebay, but I can't seem to find instructions for how to replace it. The Toshiba manual does not show anything about taking the computer apart. I am hesitant to take apart my laptop without some type of guidance. Any suggestions about where to find out how to do this?