I recently built a computer (last 2 weeks) for online gaming. Everything appeared to be running accordily at first. Keep in mind this was my first build. During the first couple of weeks I encountered some problems. While playing a racing game online the screen shot suddenly froze and I had to manually shut down the computer using the power button on the front of the machine. I also had had problems that made the computer shut down and when restarted stated that the nvidia graphics card had an error. I downloaded the latest drivers for the card which is a geForce GTX 260. This problem happened twice. While playing the game the computer suddenly lost power. I attempted to start the computer back up buy pressing the power button and heard a loud "pop". Needles to say the computer did not start. I opened the case and felt the power unit which was extremley hot. The graphics card was also very hot. I allowed the unit to cool down and still had success getting power restored. I checked the outlet and it was functioning properly. The power supply unit was a Cool Max 750w. Obviously dust was not an issue here. I removed the PSU and noticed something that alomost looked like a small amount of insulating foam on some of the fan blades for the PSU. I sent the PSU back to the online store I purchased it from. My question is that could this be a bigger problem than just a defective PSU? When i set the computer up in BIOS I really did not change any settings than the motherboard already had defaulted to. Any help would be appreciated.