I am guessing "Sound thing" is the volume control in the system tray (lower right corner).
If it is saying "No audio mixer" or "No audio device selected" then either one or two possibilities come to mind.
1. The shop that fixed your computer did not install the sound card properly (or left it out).
2. The sound drivers have not been installed or got corrupted.
To see if it is the first one or the second one, we need to get to Device Manager.
For XP, right click My Computer and select properties and click the hardware tab.
For Vista go to Control panel and click the System icon.
Click the button called Device Manager and see if there is anything with a yellow highlighted exclamation point. It likely will say something about unknown hardware or device. There might even be a name on the device that is a clue that it is a sound card.
If you do not see anything like that and there is no device in the category for Sound Video and Game controllers, option one is your choice. Take it back to the shop.
If you do see something that indicates it needs a driver visit the support webpage for your computer. Here is the URL: http://www.v2premier.com/techsupport/downloads.shtml
Select your model and choose sound to search for the driver.
Once you have a speaker icon in the system tray, if you still have sound problems trouble shoot the speakers.
Make sure the speakers have electric power connected and the power light is on for at least
one speaker. Make sure the volume on the speaker control is at least half way up.
Make sure your volume in Windows is at least halfway up and not muted.
Unplug the speaker jack and re-plug it firmly into the hole you just removed it from. Test
for sound.
If no sound, unplug and try another hole of the same size on the back of the computer and
test for sound. Continue testing until you have tried every hole the jack will fit into. One of
them will very likely work.
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