first of all make sure the jumper setting in the new hard drive are set to master. Also check the Boot Sequence and make sure teh first boot device is the CD/ROM. and if that doesnt work it might be your disk, make sure it is a bootable disk!!
put the disk in and then switch it off and back on, a messgae should say setup is inspecting your system or press any key to continue i cant remember, good luck anyways!
Allan ONeil
November 2006