|Here are a few things to try;|
Check your IDE cable, replace it if you have to.
Check the jumper is in the correct place on the rear of the HDD (cable select or master)
Try testing on the secondary IDE on your motherboard
Check boot priority/order in BIOS configuration (disable logo/splash screen, if you have this in here)
During first boot, your BIOS should report what HDD/CDROMs are hooked up to your IDE cables
Hope this helps