Some background: I have had my computer for over 2 years. After I tried to clean it, my CPU started to go over 80ºC idle. I managed to reduce it to 60ºC and used it for a long time, almost 9 months, before it started to make a weird noise. I took it to a technician, and they cleaned it and took off the side cooler, which wasn't working anyway. For 2 weeks, everything was fine.
Today, when I tried to play Team Fortress 2, I noticed strange drops FPS after a little time. When I opened Speed fan, the temperature of the GPU was 120ºC! Now, with nothing running except Chrome, with the side panel of the cabinet opened, the GPU is still 99ºC. What can I do before it starts melting?
The GPU is an Nvidia Geforce 8500GT. The system temperature reads at 38ºC, the CPU at 47ºC. There is nothing overclocked in this machine. The ventilation is a single fan at the back.