Accidentally disconnected FIOS ONT

Hey all, thanks to your collective great advice I went ahead with an ERX/AP AC combo with my Fios setup. Trouble is, while plugging everything in, I managed to knock out the fiber cable from the ONT (small yellow cable that was feeding into a bright green "funnel"-type thing). I've tried putting the cable back in, but it's not fixing anything. Any advice how to fix this as I'd rather not wait for tech. Thanks