No sound thru speaker or jack, pc do not see sound card present.

Audio output final is blown. I hope it is not an IC.

insert a headset into the jack if the sound comes thru it,if sound comes into the jack then check speakers and get the speakers changed.
if both the sound jack and the speakers does not work,check the sound ic on the mother board....

Yes.. Sound would definitely work with the headphones..

And also, you may be able to fix the internal speakers. they probably arent dead. You probably just need to reload the sound card driver.

To find your audio / sound driver. Go to this link

http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp?nav=Download

Enter your Toshiba model number. and when the list of drivers come up.

Find and download the sound card driver.. Then install it. And then restart the computer.. Your sound should work again.

if there isnt a jack connection you would have to use a set of usb speakers

Check to ensure that the speaker connection plug is fully inserted into the speaker jack on the computer. Do the same for the power connection at the speaker, too. Slightly wiggle or twist the connections and wires - one at a time to isolate the source of the failure (can be the power plug or wire, audio plug or wire, or even the jack on the PC . If related to the speaker plug, try using the speakers in another speaker jack on the PC - or other device (mp3 player, etc.) if the problem is still present on both locations, it is related to the speakers / power. Try using a pair of headphones plugged directly into the speaker jack on the PC to see if the problem is present still. If the problem is common to both speaker and headphones, the jack on the PC is likely the culprit, and a new sound card will probably have to be installed. Otherwise, replace / repair the speaker cable, plug or system.

The likely source of the problem is a stretched wire along the cord - or at the plug. A repair can be attempted if desired - or replace the speaker system if lacking tools or if unsure how to go about it.

The speakers themselves are probably not your problem. Some speakers use the USB connection while others use the Audio output jack of your sound card. The problem is likely with your sound card (assuming you use the Audio output jack). If you rebuilt your computer, chances are you're missing the device driver for your sound card (these are small programs that let your hardware talk to your operating system). You'll need to download the correct device driver for your exact sound card. You probably don't know the sound card make/model. You can download Belarc Advisor (www.belarc.com) which will scan your PC for all hardware and software. Once you have that report, you should be able to go to the sound card manfucturer's website and download the latest device driver. You can always find out if it's the speakers by connecting them to another computer. Good luck.

It on board so its going to take some really good solder work and a new jack from Radioshack. or the other solution is you can buy a sound card from any best buy, computer store or even online for cheaper then you can to fix that professionally.

If you use PCI sound card, you can try to change another PCI slot. Delete sound card in device manager. Scan device to see if system can find the sound card.

Induced noise - running signal wire too close to electrical cables.

Faulty/damaged Input reciever (jack) on subwoofer - test by isolating PC, and attaching iPod or other device to check for noise instead.

If the noise is not present when using the isolated source, your sound card output jack is bad, or the soundcard itself.

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what really matters is the quality of the usb speakers. check specifications such as wattage first and find reviews if possible. however usb speakers will probably not come close to separate speakers. i'd recommend buying a cheap sound card ($20 or so). these work great overall. $20 spent on a sound card will be a better trade off than $20 spent on speakers. just use your old speakers with the new sound card and you'll have plenty of power. after this i'd recommend headphones as they work great in this case. finally moving the sound card would probably work fine, but i have doubts.

hopefully that helped