You have go into Motherboard BIOS, and change the "Boot Sequence" there.
That should be different for everymotherboard depending on the make/model/type of your Motherboard?
Also can you start the Windows Setup and it does not recognise the SATA drive? Then in that case you do need a floppy with SATA device drivers and press F6 right after the setup installs, then setup asks you for the floppy, insert the floppy and it will load the SATA drivers.
goto BIOS setup and disable the IDE and then boot. It will boot from the SATA and if you have XP or NT then you will have the IDE over there along with your SATA.
SATA and IDE use different controllers. A slave on IDE and a master on SATA does not mean anything to each other. As someone pointed out already, choose the correct boot sequence in BIOS. Also a SATA drive can only be made bootable by installing a fresh OS on it with the correct drivers.