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In my Asus laptop i keep listening fan sound loudly , What is the reason behind it. ? Laptop is in screensaver mode also at that time i can hear fan sound loudly for some time only. Please help me know the issue

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Change fancy screen saver to blank screen. – Aki Nov 10 '12 at 14:16
@Aki fancy screensavers are ancient, so don't need much, so that wouldn't be the cause – barlop Nov 10 '12 at 14:23
put the laptop on a wood or glass or metal surface , not a carpet or bed, and also, see task manager what occupies cpu – barlop Nov 10 '12 at 14:24
in task manager >>processes there are plenty of exe files so how do I know which 1 to end – Sohail Nov 10 '12 at 14:28
@Synetech: I think that what barlop means is that, when you put the laptop on a soft surface, the fan ports tend to get blocked - putting it on a hard surface may increase the vibration noise but it ensures that the fan ports are not obscured. – Julian Knight Nov 10 '12 at 17:43
up vote 1 down vote accepted

I recommend using the Windows tools such as task manager to see what is running - look for applications that are consistantly >5% or so CPU usage, these are the ones causing the fans to come on because the CPU is working hard when you think it shouldn't be.

It is quite common for a browser such as Firefox to have a process that wont end properly, Java and Flash are common culprits. Some of the Apple tools are also sometimes problematic.

Screen savers are notorious CPU hogs and really shouldn't be used. As others have said, just set the PC to go to a blank screen and set the power settings so that the monitor turns off.

Make sure that you are using the proper power profile too. For normal use, the manufacturers recommended power profile will be the right one as it balances things. Otherwise, choose the Windows "Balanced" power profile.

For older laptops, the recommendation to clean out the fan is a good one, they commonly get clogged with fluff and other rubbish which reduces their efficiency.

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"Process Explorer" (available off the Microsoft web site) is better than Task Manager at identifying tasks that consume CPU. There is a good chance that some background tasks are causing the problem. – Daniel R Hicks Nov 10 '12 at 17:53
I agree. Here is the link – Julian Knight Nov 10 '12 at 17:59
ya thats nice , I will be using process explorer to know whci task is making me trouble – Sohail Nov 10 '12 at 19:02

Use Process Explorer to show CPU and GPU usage. High usage of either will cause heat and fan noise.

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There are some solutions for your problem:

  • Your fan is dusty, clean it
  • Ditch your screensaver (as commented above)
  • Look for CPU-Hungry tasks
  • Keep you laptop cool
  • Reduce CPU-Speed while not using the Laptop or set the power managment correctly, so your laptop clocks down your CPU while not using it (this one will have a slight yet positive impact on battery uptime)
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Even though the computer is in screensaver mode when the computer is in idle mode which means the computer is just let on due to which it may do different process like real time scanning ....and so on so. Due to this as the CPU usage exceeds a certain limit the fan's speed may increase accordingly and the fan sound as well.

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