No sound coming from test tones

I download the tones mentioned on couple of thread on avsforum(tones.zip) and also downloaded the test tone cd from realtraps.com but don't hear any sound from them. I can see the frequency graph while playing but no sound, Do I need to do something more to play these tones?
(I am directly connecting laptop to receiver, even though sounds is also not coming from laptop inbuild speakers
Test tones of the receiver works fine)

Thanks
--rubs