Pros couldn’t find anything wrong. But from one day to another. 06 May 10:27PM. May 2016. Make sure the electrical power is isolated and do it carefully to avoid damaging components. ... at startup, and at random times while the computer is locked. CPU fan is making rattling noise. It only makes the noise when the computer … It happens like 1/4th of the time. Hi, Suddenly my XPS 15-9570 start doing a rattling noise when fans are on. What would happen was a rev up on the fan so it was really loud, and the monitor wouldn’t come on and I’d have to restart the computer. If you are running a stock intel cooler it would be much easier to press on the center of the case fans to find out which one is causing the problem rather than installing the CPU cooler without knowing if it really is the culprit. There is a possibility it maybe the CPU fan if the CPU fan is connected to the CPU header. When the fan starts emitting a rattling sound, there is a good chance that the fan is about to fail. Hello everyone, recently my computer is making rattling noises on start up...It doesnt do it all the time. 5. Your CPU fan serves the purpose of cooling the machine by spinning quietly in the background. May 2016. 5y. Cleaning it isn't helping. This typically happens because of the dust that accumulates on the fan over time. The fan doesn't make any noise at startup when the computer is already on and I turn it off and then power it up again (warm boot). The problem is the fan, at startup it begins at full power and then when the bios kicks in it slows down. Clean the vent holes with compressed air, when computer is off and "cold" (it could be that an accumation of dust is causing the fan to make the noise you are hearing), see if it helps. Usually, the buzzing and grinding sounds our laptops tend to make are to do with the CPU fan. Tjoeb123 . The fan usually becomes noisier during a system shutdown or startup. If you mean for the first few seconds, why do the fans seem to run at full speed, before settling down? Adjust the power settings, let the computer cool for a few minutes, and then troubleshoot the noisy fan. I don't know if this may depend on fans touching on something? When I turn my PC on and it makes the noise, I turn it back off and 10seconds later I turn it back on and then the noise is gone. You should also clean out dust and debris from all grilles and fans. If you’re used to working in a noisy environment, you may miss the exact moment your laptop starts making suspicious noises.However, when you start implementing some of those home office soundproofing tips I keep talking about, you may find the noise impossible to ignore. By reducing the fan speed your computer is probably now overheating - especially if its happening after a set time from cold start and on high load like 3D games. 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