Can anyone assist with problem spot lights

[pauldascott]

I have recesed spot lights in the living room six of them controlled with a dimmer they are the older larger bulb version not the new funky halogen type.

The other day one bulb went with a pop when the lights were turned on and it fliped the junction box so after fliping it back the other lights came on and the broken bulb was reveled I got a replacement bulb and put that in and nothing happened the other lights came on but this one did not i took the bulb out next to the this one and tried the new bub here it didnt work so i thought it was a dodgy bulb but when I replaced the working one that didnt work either I tried this again with the next one and the same thing happens if i remove a working bulb and then put it straight back it then no longer works obviously the bulbs are fine but im bemused as to what the problem could be.

 

[BS3036]

Screw or bayonet fittings? Sounds like the springiness has gone out of the fittings.

 

[pauldascott]

they are screws the bulbs when screwed back in do make a connection im thinking wiring.

 

[breezer]

how do you know? you cant actually see