No Sound

I obtained a Compaq Presario 425.  It has a 486 DX CPU and 20 RAM.  I recieved it with Win 95 on it.  Everything works except the sound.  I upgraded to Win98 and still no sound.  I have tried three sound cards that all work and no sound.  After proper installation of each sound card the windows system reports that it is working properly and that there are no conflicts.  I keep the volume control all the way up and the mute is not on.  Nortons system checker finds no problems.  Any suggestions??
PedstechAsked:
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Somebody_elseCommented:
did you plug speakers into the sound card? if so, are the speakers working? if you did and the speakers are working did you put the plug into the correct hole? (usually there are like 3-4 holes)
these are probably stupid questions but you know "leave no stone unturned".
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s_turner99Commented:
Can you verify for sure that the speakers are working properly?  For instance, plug them into a headphone jack on a portable CD player?
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PedstechAuthor Commented:
I am using the speakers from my regular computer and they work.  The speakers are plugged in the speaker hole.
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abragerCommented:
If the sound card and speakers are working all right, then the problem is in the motherboard.  Try putting a card into a different slot.  If it still doesn't work, then I'm going to say your motherboard's defunct and your best bet is to resell it or scrap it for parts.
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PedstechAuthor Commented:
The computer only has two ISA slots and I have tried both.  I have always felt that the motherboard must be damaged but was sure hopeing that someone would come up with something that I have not tried.
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