Okay, I have a friend who lives two hours away from me. I built a computer for him and its worked great for nearly a year, but now he says one of his fans is making an annoying grinding, squealing type of noise. His case is the Antec SLK3700AMB Link and he is using the fan (back fan) and powersupply that came with it, plus another Antec 120mm fan (front fan) Link. His video card is a Gainward GeForceFX 5900 128MB Link and his motherboard is a MSI 865PE Neo2-FIS2R Link. His proc cooling is stock Intel heatsink/fan. He says it sounds like the bearings of a fan, which would probably mean a dying fan. It makes the sound only for about 15-30 minutes following reboot, and he seldom reboots. It made a soft, but high-pitched sound once that was irritating enough to wake him up. There was plenty of dust in the case when he opened the case up, but he cleaned it up. Here's what he found when he did some testing: the video card fan is making an unveven sound, and he thinks it is most likely the culprit, and the NB fan is definitely the loudest fan in the case. So, can you guys give me any tips or suggestions on nailing down the right fan or isolating the problem more so we can be sure that it is the video card fan or not? If it is the video card, what is the best course of action to take next? Is it a big problem, or just a nuisance? If you need any more information, just ask and I'll try and get to you.