First of all, unless a diskless system is used, a computer must have at least one hard disk to run normally. Should the hard disk that is in trouble now be a new hard disk, moved or directly added to the computer host? You can't start it when you connect the hard disk. It is estimated that there is no boot function on your new hard disk, but your BIOS boot sequence is from this new hard disk, so the boot is unsuccessful. This problem can be solved by entering the BIOS at startup and adjusting the first boot order to your original hard disk.

If it is not because of the startup sequence, the old IDE hard disk is connected with the same data line, which is divided into the master disk and the slave disk, so jumper settings should be made on the hard disk, otherwise an error will occur. There is no more, it is estimated that one of the hard disks may be damaged (this last situation makes it impossible to start).