But with only Windows 7 and the symptom I can only offer the usual reset to factory advice then avoid what broke it last time.
If you think it's hardware then replace the sound system for cheap. Here's what I use.
I have a little problem.
The audio of my father's PC (with Windows 7) doesn't work. It doesn't work when he tries to see youtube or any website with videos.
When we talk on skype the audio starts working again, including on youtube etc.
I made my checks but I don't seem to understand the reason behind this problem.
Can you help?