I have an Acer Aspire 7720G laptop that has only an internal sound card. Since yesterday, there is no sound. I tried to find the problem by searching the Internet, but couldn't make progress. At last, I found an answer on this site that gave a link to an Acer site. Here, among others, the Driver Whiz found 18 driver problems on my machine. It costs 30 €. Now, before buying it, I want to ask you how to get rid of the problem.
I have activated the loudspeaker icon on the task bar on the lower right. There is the speaker visible with a white cross on red background (×). When I go with the mouse on it, it is written that there is no audio output device installed. However, the device manager (called Gerätemanager in the German Windows Vista) shows the Realtek High Definition Audio card. I tried to update the drivers, but they are up-to-date. When I click on the device manager under "System control" > "System and maintenance" > "System" on the left side (Systemsteuerung\System und Wartung\System) and double-click the Realtek entry, the properties dialog opens, where it is written that the device is functioning properly. There is no yellow or red icon beside the device.
I also tried the Microsoft FixIt utility, but no audio device is enlisted. When continuing, it says that a problem exists with an unknown device. Trying to solve the problem failed.
Can you advise me a site that can support me further?
Thank you in advance!