You will be able to get access to the BIOS. Depending on the machine you will need to press the DEL, F1, F2, F10 or maybe some other key combination. Just start tapping the correct key comb as soon as you power up.
What is the IDE drive set as. Master, Slave or Cable Select? Have you connected it to the same IDE port as the DC/DVD drive (assuming this is also and IDE device).