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Windows 7 ultimate 64 on i7-3610 QM Samsung laptop NP550p7c

Windows Update is up-to-date, all drivers in Device Manager appear to be OK

Strange problem:

After booting the machine, there is sound during the boot-up, but sounds like Movies and Youtube videos are silent.

If I go to Control Panel -> Sound -> Sounds

Then select a system sound, say (Asterisk) and press Test, that sound plays, then the general sound system on the PC works as normal.

So what I've got is a Windows Installation that is totally silent until I go to Control Panel and test a System Sound.

Wierd or what?

In Control Panel -> Sound -> Playback I only have one device listed: "Speakers - Realtek High Definition Audio - Default Device" with a green tick.

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