try booting the computer through the bootable Floppy or bootable CD(recent Digit CDs for that matter),after setting boot priority to Floppy and CD respectively.If the PC boots,then the BIOS may be alright.if it doesn't there may be a problem with BIOS and the give it to service provider to repair it.
As you said,that it gave same error for another HDD,try the above option and croos-check it.
Try changing IDE cable of the HDD.
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