I'm guessing both are IDE Cabled?
If so, I'd get a new cable (one for whichever isnt working) and try that...
You said you already switched them around though so I doubt that will do much
It's possible your motherboard is defective as well...
If you go My PCHF on the left hand bar on the Forum, you can edit your data, click on Edit Options, and scroll til you see where you can type in your system specs and go ahead and enter them there
It will help in this case and certainly in the future
btw welcome to PCHF
