The fan is on all the time, and is very noisy. It has nothing to do with CPU usage, and I even reformatted it, to no avail, noise still very present. I cant remember if it has always been this noisy, but I can't believe this is the normal noise level!
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As Dean said, if the humming noise is always present even with the fan spinning at low RPM, replace it. If it's only loud when booting it might be normal ; some computer's BIOS spin the fan very fast when booting and when the Operating system or preset parameters take over, they gradually lower the speed. By the way, unplug the fans one at a time to find which one is causing the noise. If it is a case fan they cost only a few bucks, if it is the CPU fan it is a bit more expensive but aftermarket cooler can be found for around 20$. If you need to replace the CPU cooler, make sure you clean the old thermal paste and apply some fresh one. For a tutorial how Youtube is your best friends ;)
Could be the case fan or the CPU fan. Open the case and determine which fan is noisy by unplugging them one at a time. Replace the bad fan with a new one and you are good.
There are two large motors in those. 1 is the fan and the other is the compressor. There is nothing that you can do about the compressor but the fan can get noisy if there is an ice build up from the coils not defrosting right.
Some fans are automatically temperature-controlled -- they speed up, and, of course, make more noise, as the temperature rises.
Background tasks, such as Windows Automatic Update and scheduled virus-scans, can cause the computer to become "busy" when otherwise "sitting unused".
Next time the noise increases, enter CTRL-ALT-DELETE and open "Task Manager", and click the "Performance" tab, to see if the CPU-usage is reaching 100%. Click the "Processes" tab, and then click on the 'CPU' column-heading, and click it a SECOND time, so that Windows lists the "top" consumers of CPU at the top of the list of processes. Which process is consuming the majority of the CPU?
The fan may not stay on all the time - its a feature of laptops to help save power. The fan is also variable speed. As the CPU gets hotter, the fan speeds up. When the CPU isn't being used as much and is cooler, the fan slows or even stops. It turns on to full speed when you first turn the laptop on as part of the BIOS system check.
The noise is another issue. You could have a broken "fin" or fan blade. The bearing could be going out. Something may have simply "crawled" inside the fan's output vent. In any case it may be worth your time to have a professional open up the laptop and look at the fan. I have heard a LOT of noisy laptop fans in my day, and believe me it's not the worst thing to put up with.
Your CPU fan should always be on while the computer is on. If it's off, your computer is going to crach in a matter of time. The noise is normal. If it's to loud, replace the fan. Nothing major. But it is normal for the fan to be loud. Thats a good sign it's cooling the CPU. But you can get a shfter 1. Your computer might over heat though. Good luck.
The sound you are hearing is probably the fan, This fan has a noisy bearing and will eventually lock up and the fan will stop spinning and therefore the CPU will overheat and shutdown.
The fan needs to be replaced.
very likely it is the power supply fan. I also had a noisy fan and replacing it was a solution. try to get the measurement for the screw mounting dimensions and the height (thickness) and also the driving voltage then search ebay's site. it can be cleaned and lubricated however...
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