Good news!. Try a reset of the inertia switch cut-off button back of the glove box by the A-post, and see what happens.
Clean the connections too. Sometimes they just plain fail, or can be so sensitive that they can let you down. Best to replace if that appears to be the case. Not specific 260 and easy to find, I believe.
Edit (David). Think if the inertia switch had tripped, you would not be able to start the car at all, so maybe I was leading you up the garden path. Sorry.
David