Computer wont detect slave drive

i have an old computer that i am trying to add a slave 80gb drive to. it already has an 80gb drive and a dvd drive both masters on separate ide channels. but when i try and add a slave drive it will not detect it atall. The only way i have got it to be detected is when i put it as a master on a separte channel but then i carnt use either the dvd drive or the other hardrive as there is only 2 channels. it seems on both channels the motherboard is unable to detect slave drives ive tried cable select and jumpers but nothing is working. anyone have an ideas as to what could be wrong?

thanks in advance
 
Make sure the hard drives are on the same ide channel. If this is an older computer you may need an 80 pin ide cable. Set the hard drives jumpers to cable select and put the master drive on the farthest connector and the slave on the middle connector. That always works.
 
If when you connect the drive you have set as slave nothing is detected that is a good sign that the jumpers are wrong. Check the drives that are already installed as well.
 
its in the bios that they they wont detect and i have already tried all of those ideas that you have guys. thanks for the quick response though. i am now pretty sure its a problem with the motherboard though it was a prebuilt computer could something maybe be locked?
 
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