If your Powervault NAS loses network connectivity or won’t boot into the OS, you’ll need to physically access it via the console port at the back. From there you can edit and upgrade the BIOS, run a recovery boot (boots the OS from another drive) and perform hardware diagnostics.
Here’s the settings you’ll need for HyperTerminal:
Bits per second: 115200
Data bits: 8
Stop bits: 1
Flow Control: Xon / Xoff