04 Venture - Start issue

This car has been great in terms of reliability and no leaks (read not a drop) anywhere.

Today it has decided to quit without notice.

Turn the ignition and it appears to be turning off/on rapidly sort of like maybe it's shorting or something. Dash lights go off/on as this occurs. No attempt to start... as you hold the key on start dash lights the rapid on/oof action described above.

Anyone have a clue where I should start troubleshooting this thing??

Thanks,
Alex

...Turn the ignition and it appears to be turning off/on rapidly sort of like maybe it's shorting or something...

This is a classic associated with corroded battery poles or a shorted battery cell. Verify these first.