Our living room has 4 dimmable lights controlled by 1 switch and slider. Many years ago, we replaced the incandescent lights with fluorescent bulbs (we didn't know that fluorescent bulbs don't dim out of the box). A couple weeks ago, some of the fluorescent bulbs randomly stopped working. Some days they'd turn on, other days they wouldn't,so we decided to replace them all with LED bulbs.
However, only one of the LED bulbs will turn on and dim while none of the others will turn on--let alone dim. When I reverted back to fluorescent bulbs, all but one work normally (at least in the 5 hours since reversion to fluorescent).
Do y'all have any tips for troubleshooting? I'd like to use the LEDs from now on.
UPDATE, 2018-01-26: My dad replaced the light fixtures, and now all of the LED bulbs dim properly. Unfortunately, I didn't get a chance to see what spec/model the old fixtures were before he threw them out.