OK, why not go to dell.com, pop in the service tag and update the chipset driver then the sound driver.
I take it you know to look in device manager for ! signs and disabled things as well as Mute.
I have a Dell Inspiron 1545 64 bit with Windows 7 Home Premium service pack 1.
Suddenly my sound has got disabled for no reason. I go to 'control panel' then when i click on 'sounds' nothing happens at all. I have not had any Windows updates for about a year now so it's not that. I have no audio icon on the taskbar, i have also been to device manager and re-installed the sound which is 'idt high definition audio codec'.
On the services list i have no Windows Audio which is very weird.
I have an anti-virus installed and a junk cleaner, they were installed way way before this happened. It's almost like my computer is saying i have no audio device installed. I will be very surprised if i can get this fixed because i have tried everything.
I did some sound checks, you know when you start the computer and press f12, well i got 1 hardrive error Error code: 2000-0146, after that finished it asked me if i want to check any specific folders and i checked the sound and it played it from left and right speakers and also did a mic recording.
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I tried updating my drivers from the dell website using my service tag and after i install them, all i get are errors. I have no yellow marks or anything in my services list. These are the errors i get after i install the drivers from DELL.
Yes, i typed my service tag in on the dell website and it gives you a list of drivers to install for windows 7 64 bit. there were 2 audio drivers and 1 for the chipset. After i install them i get errors. I'v e noticed on my device manager, when i click on some system devices, on some of the devices, it says no drivers are installed and when i try and update them, no change.
Sometimes they install a new motherboard and the Dell drivers are no longer applicable.
How about a Web Speccy to see what this machine is made of?
Read how at https://www.piriform.com/docs/speccy/using-speccy/publishing-a-speccy-profile-to-the-web