I would like to advice you that confirm whether your cables as well as power connectors are connected properly to all the devices if both the drives are not been recognized it means there is problem in the connector or change your hard drive cable whether it may be defected one or if they are connected to one single IDE slot check that one is master and the other as slave and remove the cable from IDE slot and plug-in other slot and check if they are being identified by the computer or else you can check your drives in the BIOS setup and if its being identified by your PC then install your operating system and if still it hangs out your drive is gone bad or recheck your jumper setting again.