So the other day I got a cheap 'gaming' laptop of gumtree for £250. It is an ASUS K550JX with i7-4720hq and a GTX 950m 4gb with 8gb RAM. I installed a SSD and reinstalled windows and downloaded a game. My CPU and GPU was getting over 90c! So I took the laptop apart and replaced the thermal paste, bearing in mind that I've only ever done this with desktops. I believe that I've correctly replaced everything, now getting 50c in games, but my WiFi card isn't working that great at all, it works for about a minute then after that it just doesn't load up anything. Chrome sometimes pops up with an unresponsive error, so I've reinstalled drivers and chrome but no go. Ethernet works fine.