RealTek HD Sound Problem
This works for my 7540 Acer laptop w/ built in Speakers and SoundCard
a) The Laptop has 3 Ports on the side- Pink,Green,Black
Pink Port is LineIn for an external device player jack
Green Port is LineIn for the Microphone jack
Black Port is LineOut for Headset or External Speakers jack
Plug the Green jack on Headphone - into the Black Port on the laptop.
b) Go to Control Panel and open - RealTek HD Audio manager
On the top of Page are 3 Icons -
One Icon is labelled Speakers One is for Digital optics, one is for Mic,
The Speakers Icon is misleading as it is also for Headphones (LineOut)
Select Speaker Icon and make it Default. Also tick Full Range - Front LR
Ignore the 4 vertical Analog Icons on the right side.
You should now have Headphone sound if your volume is not Muted.
Hope this works for Y'all.