I am trying to add a 2nd Western Digital 320 G hard drive with a cage to mount it in for a Dell Dimension 2400Intell Celeron 2.4 GHz PC with 1 G of SDRAM memory. I have a 120 G Western Digital HD, 2 CD/DVD combo drives, and a floppy drive connected now to the MOBO. I have a new 80 pin IDE cable with connectors for master, slave and the card/or mother board. It is a miniATX motherboard. The BIOS is AU6. It is WindowsXP Home Edition SP3. I have recently installed a Masscool XWT-RC018 3-Port SATA & IDE PCI Card - 2 Internal SATA, External SATA, Internal IDE, SATA 1.5Gbps Support. When ever I try to connect the new hard drive, the PC fails to boot. I have tried switching from Cable Select to "master" and "slave", changing the BIOS to auto detect, and switching the boot sequence. What else can I do to make this work? Re-configure the cabling and boot sequence? Change/add the jumper shunts? Do I need to adjust the software or hardware for the PCI 3 slot since briefly my son's friend had installed a video graphics accelerator card that I have removed and uninstalled its drivers, since it was causing my PC to crash?