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
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.