junno

I believe fan on my Power supply or something broke since when i play a game such as WC SC CS or D2, shortly after my computer shuts down.. So i tried to open up the computer so i can replace the power supply but i cant seem to open it.. It sounds kind of stupid but my computer is Sony Vaio PCV-RX755.. i can get the top cover off but other than that.. i cant remove anything else and if i use too much force im afraid i'll break the computer so does anyone know how to open it?