Hi, I'm trying to install Snow Leopard on my Toshiba Satellite A505-S6033.

When try to install Snow Leopard using methods like iBoot and Empire EFI, I am usually able to reach the beginning of the installation screen; however the trackpad, keyboard, and usb ports all stop working working at that point. Thus, I have no way to proceed with the installation.

The verbose boot displays the message "The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying." twice during the boot of the OSX installation. I have tried many things and cannot fix this issue.

The above problems occur when my bios is version 1.10 or 1.20. When my bios is version 1.30, the installation boot always hangs at "ACPI : System State [S0 S3 S4 S5] (S3)". I have downgraded to 1.20 for the time being.

My laptop has an Intel Core i7-720QM processor, a Nvidia GeForce 310M (512MB) graphics card, and 4GB of RAM . View the product page for more specs.

Any help would be greatly appreciated.