Does not sound like a timing issue. Your HDTV probably cant display the low resolutions set, download and use HD720 for your TV, try SUPERPLUS laced @ 800x600 and see if that works on your monitor.
Might be as above said, faulty installation, try the modes I posted then remove and reseat your Indivision and see what happens.
Also make sure you are using a strong enough power brick for the Amiga.