If it is a buzzing or whirling noise it could be that your fans inside the case are going to die soon. Also if you have something like Auto Fan Control, it might bump the speeds up on them and cause the noise.
I recommend doing this:
-Shut off your PC and disconnect all connections to the tower.
-Put the tower on a table and open the side panel of the case
-Get a can of compressed air (Under $5 for 12oz. @ Walmart). DO NOT USE A VACUUM CLEANER. ALSO MAKE SURE YOU ARE GROUNDED BEFORE TOUCHING COMPONENTS. You can ground yourself by touching an unpainted surface on the case.
-Use the can and blow out all dust and debris inside your tower.
On the fans:
-Get a pencil or finger and put it between the blades of the fan. Get the air can and spray the fan. IF YOU DO NOT HOLD IT, IT COULD DAMAGE THE BEARINGS IN THE FAN.
-Then get several QTips and brush off any caked dust on the blades. The tips will be very dirty and nasty after this process.
-Since you play games on your computer, make sure to clean the GPU fan.
On other components:
-Blow the air on your HDD, DVD Burner, Mobby, PSU, GPU, CPU Heatsink, and other components.
-DO NOT HOLD THE CAN UPSIDE DOWN OR DOWN. IT WILL SPRAY COLD LIQUID AND MIGHT RUIN YOUR COMPONENTS.
Vents:
-Make sure to clean the vents. Use the air can to blow out dust in the vents. If you don't blow dust out of your vents, it could trap hot air and your PC might overheat.
Your done now. Put the side panel back on and reconnect all connections to the back of your computer. Your computer should work fine and it fails to boot, you might accidentally touched a component and fried it with your static electricity. You will need to replace the component if this happens.
Tell me if your fans make funny noises after this.
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