[Fbone]

Originally Posted by MikeB1972

Generally only if you have dimmer switches, Do you don't have dimmers everywhere?

Failing that it's possible the connectors are not quite touching (Unlikely if it is all lamps though).
http://www.homewatt.co.uk/blog/help-...lb-wont-light/
Unplug the lamp first

Originally Posted by Cinisajoy

Take a light from the lamp with you when you shop for new ones. Or buy the adapter that DuckieTigger mentioned.
Otherwise sounds like a wiring problem.
How old are these lamps?

No dimmers but one is a 3-way that I know wouldn't work.

I pushed the tongue up a little but no change. I didn't try the adapter because the bulb wouldn't fit under the wire bracket that holds the shade.

Since the lamps are about 12-15 years old, the problem is most likely energy supply as DT said. It's not worth buying new lamps so save a few watts.