By the information you have given, either the Primairy IDE is switched off in BOIS accedentely, or your old hard drive has destroyed it in the process of dying...
Or... Your old drive IS in fact not dead and only the Primairy IDE went down.
In such cases, buy an PIC IDE controller, and switch BOTH ide channels off in BIOS. (If FDD oncard, ALSO switch FDD off in BIOS.)
This will cost much les then buying a new Mainboard (If they are in Stock anyway)
Remember, Do NOT put it in PCI #1 if you are using an AGP videoboard!
These two slots are bonded with ONE irq!