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No sound Toshiba M45-269 laptop

I suddenly lost all sound on my M45-S269 laptop. I don't have sound on startup, in media players (windows media player, real, or any others). I get an exclamation mark under sound in device manager and the error no sound card found. I have dowloaded new drivers and get same message.

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Seems that the drivers for your sound card is not installed. Just update the sound driver. Where did you purchase the product? Where did you download the driver? You could have download a driver for a different OS.

If the excalation mark on your device manager is gone, that should fix the isse.

Hope this helps.

Posted on Sep 16, 2008

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Try running check disk.

To run the check disk utility you will need a repair disc ora operating system disc. Put the disc in the cd drive and boot fromit. You want to get to the Dos Command Prompt (Black screen with whiteletters) and type the following command: chkdsk /r
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In Vista and Windows 7 you want to get to the recoveryconsole and look down at the bottom of the window for the Dos Command.------------------------------------------------------
If check disk does not solve the problem then you'll have to reinstall your operating system.

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It appears that accidently you have clicked on the speaker icon in windows media player which has muted the sound. Please click again on the speaker icon. The sound will come back again. If it does not then check the volume settings on the task bar. This ma have been muted. Click on it and see the volume settings. The slider should not be absolutely down. Slide it up. The sound will come back again.

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You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:
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  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
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All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

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Dear Biswaranjan.
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