[kosmiq]

The thing that makes you unable to boot the original MSDash with the chip off is the fact that you renamed "xboxdash" to something else. The original BIOS looks for xboxdash to boot.

The thing with that you can't access other drives on the xbox is a little strange but could be because it was not properly formatted.

Here is the simplest way to install another dashboard on the xbox:
Get SlaYers AutoInstaller or Auto Installer Deluxe 2.11 (latest I know of atleast), burn to a DVD-r and boot in your xbox (with the chip on). Run the installation procedure on them and your xbox will be formatted, everything installed and ready to be used. As it will format the xbox drive all your savegames and similar will be lost.
If you did that, do it again but make sure you choose "complete install" so that everything gets removed and installed again.