Your Toshiba doesn't have a separate sounds card.These are part of the main motherboard in all laptops regardless of manufacturer.
If your sound card has truly failed then your only option is to replace the main board which is not a cheap thing to do. Usually the lack of sound is going to be from a driver problem or just a setting ie the mute is on.
Depending on when your laptop was built it may have the drivers located in a directory on your C drive. If you open my computer or windows file manager and look you should see a directory called "Drivers". If you don't then we need to get them from Toshiba.
To get to your support page first go to www.toshiba.com. Then click on Support then mobile computing then Tech Support.
If this links works you can just click it.
http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp?nav=Repair
Click on laptop, then Satellite and then scroll down until you see your M105-S3004 in the right most panel. Click on go. This will now take you to your support page. This has all the information, drivers, software, notices etc for your laptop. It's worth bookmarking this or knowing how to get to it.
You can sort by operating system so it will only show drivers for vista or xp or 7 etc.
Now click on the downloads tab and then look for the Realtek Audio driver. That is what you want. Download it and save to your desktop (easy to find it then) or run it. After you run it it may need to reboot before you get sound.
If this is being caused a setting then you need to check programs that have sound such as media player. You can also mute the sound by pressing the FN (function) and one of the F keys or escape. You may also be able to mute it by pushing on the volume controls. Anyway these are what you need to look at . The trick is to look at what you have used recently otherwise there can be quite a few to check. I have a file manager I use called Frigate which replaces My Computer. IT has sound controls in it for some reason that will override everything else. Unless I think to look there I can't get my sound to un-mute.
As a side note I had a Tosh A70 and the sound would drop out. Toshiba blamed Microsoft who blamed Toshiba and so on. That was never fixed even with new drivers.
A friend spent a few minutes on this problem and we got all the sounds redirected through my desktop speakers with the single exception of my MSN Live Messenger alert tones. Any idea why those sounds would be routed through my laptop speakers when all other computer sounds are coming through the port replicator and out my desktop speakers, now??
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