You should study what your BIOS has to offer for boot settings.
For example: connect the IDE drive, go to BIOS, check out boot order settings. Depending on your BIOS, you can choose between floppy/DVD/hard drive, and there used to be another setting for choosing between hard drives. Usually there's a list to choose from, so you should simply select your sata drive.
Some motherboard manuals provide documentation for boot order settings, you could read up on that. What type of motherboard do you have exactly?