You can’t boot from the floppy. It doesn’t have the necessary boot sector … better off just setting the boot order in bios to “CDROM, HDD, FLOPPY DISK/Other” so it checks the CDRom first.
Boot from the Install CD, but as soon as the installer starts, push the floppy disc in … wait until it gets to the message about loading drivers scsi/storage controllers and press F6.
It will then ask you to load the drivers, and it’ll show you the drivers which you have on the disc ->highlight & press ok … and then follow the instructions to continue the installation.
Be aware that you cannot recover an hard disc image from an IDE based HDD to a computer with scsi/SATA HDD if the bios doesn’t support emulation/compatibility mode for SATA HDD’s.
You can image the new SATA HDD OS drive & restore it to the Sata HDD though.