What do you mean by "Chk adjust volume unable to access it"? You can't access the Volume Control app in Windows? I'm assuming you are running Windows XP... anyway, go to:
Start-> Control Panel-> Sounds and Audio Devices
Is the "Mute" checkbox checked? Is "Place volume icon in task bar" checked?
If you can't see anything wrong, click on "Advanced" (under "Device Volume" section, not "Speaker settings") and make sure none of the "Mute" check boxes are checked on the volume control app. Also make sure the sliders aren't slid all the way down (especially for "Volume Control" and "Wave").