[thailen]

I have an ACER Notebook PC with 2 speakers and an HDMI cable connected to my large-screen HD TV. I has a Windows 7 Home OS and a cable modem for my Internet connection. Yesterday I noticed while clicking on a Forbidden Knowledge web site, the video produced a distorted sound so bad I couldn't listen. I tried other web sites, attachments(with sound) to received E-mails, disconnecting the speakers, checking the connections in Control Panel and all seemed to be functioning correctly, except for the distortion, which was relentless, without exception.
What to do to fix it?

[Computerpete]

Have you checked in the device manager to see if there is any problem there

[thailen]

Yep, no problems on any of system components, specifically on the sound components

[Computerpete]

Try unplug the speakers from your laptop and see if sound is distorted in your laptop speakers

[thailen]

I removed the add-on speakers from the PC and the PC's own speakers produced the same distortion...

[Computerpete]

Does it happen when you play music CDs

[Computerpete]

If it does the same when you play music CDs it could be a driver problem in that case you need to reinstall the driver for you sound card

[thailen]

After trying everything you and others suggested, I turned the PC off and back on and Guess What? The distortion disappeared. Who knows how it happened and what changed it?
Thanks for your suggestions...