Don’t take this to the bank, but the problem you are experiencing may be as simple as changing the jumpers on the rear of your old HDD to “Slave” or “Cable select” position. Be sure there is no power to the computer, touch the case while the power is off, but the power cord is still plugged in, then unplug the power cord and proceed.
I had the same problem till my neighbor came over, called me a dumb s**t, moved the jumpers, and then laughed as it came to life.
Failing this avenue, I’d suggest you visit your local 'Puter shop. Circuit City and Best Buy both have experienced tech’s who have checked my stuff free when I visited. Hope this helps.