|Maybe I should take it for granted I guess - but you didn't seem to mention that you had gone into the BIOS Setup to see if the drives are being detected or not. You might be able to enable them if they are detected there in the BIOS, with the Exit & Save. |
But maybe secondary is automatically detected at the boot/startup anyway, I can't remember what happened when I installed my CD-ROM a couple of years ago! Going into the BIOS just might get things kick started again - it is just another machine isn't it!!
It sounds like you just aquired this PC, so you could 'follow' the cords from plug to plug just to make sure everything is where it should be & secured properly too. I mean, you're right! The sucker should be working - if the cords are A-OK. Two drives just don't stop working at the same time do they. Good Luck!