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This is a 3-way speaker; specifically which speakers do you hear something from and which speakers do you hear nothing from? If the woofer amplifer is blown, for example, you will hear nothing from the woofers, but will hear sound from the midrange speakers and the tweeter.
Hi, I think the speaker is getting damaged. When you strike hard keys, it makes crack sound i guess. If you can open the keyboard and test the speaker by using a battery and run a wire to the positive and negative spot of the speaker. If you hear a clear sound after testing the speakers, that means the speakers are working properly,but if it does not sound clear enough,that means the speakers are not working well...
When a speaker does not sound good enough, it's usually a sound IC problem that will need to be replaced.
Are the speakers themselves not working, or is the problem that the computer's sound isn't working? You can test the speakers by plugging them into an iPod or other device. If they aren't working that way either, you'll need to repair or replace the speakers.
If the speakers work on another source, the trouble is in the computer. Reinstalling the sound drivers often solves "no sound" problems. The drivers may already be in a folder on the hard disk (most manufacturers have a drivers folder somewhere). If not, you can download the drivers from the computer maker's website.
If there's still no sound after reinstalling the drivers, the sound card is bad. If the sound is built onto the motherboard (the usual case), you can install a PCI sound card as a replacement. They aren't expensive and you can find them at large retailers or online.
there a loss connection in the speaker of your system. locate the loss connection and fix it. if hard for you fix then you should call the technician to fixed for you ..or either use external speaker so that you can hear sounds without using headset.