Speakers work but no sound

Question

Speakers work but cannot get any sound output.  Running windows 7 on Intel iMac.  Speakers sound on booting and graphics in Control panel and on toolbar indicate sound is being recieved but nothing comes out of speakers or headphones.

Answer 1

This is your machine - http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-3.06-24-inch-al uminum-early-2008-penryn-specs.html
It is an iMac from 2008. You can download the .zip file directly to a new folder on the Windows side, unzip it and run setup.exe from this folder.
This is what you need - Boot Camp Support Software 4.0.4033. (From System Requirements).
Post Date: Mar 14, 2013
File Size: 601.76System Requirements
MacBook (13-inch, Late 2006)
MacBook (13-inch, Mid 2007)
MacBook (13-inch, Late 2007)
MacBook (13-inch, Early 2008)
MacBook (13-inch, Late 2008)
MacBook (13-inch, Early 2009 & Mid 2009)
MacBook (13-inch, Late 2009) *
MacBook (13-inch, Mid 2010) *
MacBook Air (13-inch, Early 2008)
MacBook Air (13-inch, Late 2008 & Mid 2009)
MacBook Air (11-inch & 13-inch, Late 2010) *
MacBook Pro (15-inch & 17-inch, Core 2 Duo)
MacBook Pro (15-inch & 17-inch, 2.2 & 2.4GHz)
MacBook Pro (15-inch & 17-inch, Early 2008) *
MacBook Pro (15-inch, Late 2008) *
MacBook Pro (17-inch, Early 2009 & Mid 2009) *
MacBook Pro (15-inch, Early 2009) *
MacBook Pro (13-inch and 15-inch, Mid 2009) *
MacBook Pro (13-inch,15-inch, and 17-inch, Mid 2010)
MacBook Pro (13-in, 15-inch, and 17-inch, Early 2011 & Late 2011)
Mac Pro (Mid 2006)
Mac Pro (Early 2008) *
Mac Pro (Early 2009)
Mac Pro (Early 2007)
Mac Pro (Mid 2010)
Mac Pro (15-inch and 17-inch, 2.2 & 2.4GHz)
Mac mini (Mid 2007)
Mac mini (Early 2009 & Late 2009)
Mac mini (Mid 2010) *
iMac (17-inch, Late 2006)
iMac (20-inch, Late 2006)
iMac (24-inch, Late 2006)
iMac (20-inch & 24-inch, Mid 2007)
iMac (20-inch & 24-inch, Early 2008)
iMac (20-inch, Early 2009 & Mid 2009)
iMac (21.5-inch & 27-inch, Late 2009) *
iMac (27-inch, Late 2009) *
iMac (21.5-inch, Mid 2010) *
iMac (27-inch, Mid 2010)
iMac (21.5-inch, Mid 2011 & Late 2011)
iMac (27-inch, Mid 2011)
all these drivers support Windows 7, 32 bit
* drivers that support Windows 7, 32 and 64 bit