I experience problem with my laptop with OS W7. It started to freeze after 15-20 mins and end up freezing after couple of minutes. I can enter BIOS , restore default setings , but still the same. After freezing I have to hold powerr buitton to shut off, and then when I start up, it recomendes runing the test mode , but it freezes even during the test. I am duing it all over the samo procedure, and everytime happens the same thing. Paste soldering was changed and coolers are cleaned, buit no improvemenet.