One clue that your ballast is the reason for a non working fluorescent light is the light bulbs struggle to turn on.
T8 fluorescent light not working.
Aside from a burnt tube other factors such as a worn starter and loose or oxidized electrical contacts can contribute to a fluorescent light not working properly.
A burnt out lamp is the most common reason any light fixture does not light.
Also these dimmers will not work for incandescent fixtures.
Or you can read the printing on the tube to identify the correct replacement type.
I have 3 different ballasts and none of them work with the led tubes.
Like other lighting fixtures fluorescent light fixtures sometimes work improperly.
The new t8 led tubes are not working on my ballasts.
A good way to check that your ballast is the culprit is to turn on a voltage detector and hold it next to the wires supplying power to the ballast.
To replace remove the old tube and bring it to the hardware store.
The no part of this question is that the conventional dimmer switches you can purchase at the hardware store are designed for incandescent lighting only not fluorescent lighting.
How to troubleshoot fluorescent light fixtures.
Diagnosing which problem you have and how best to tackle it is a fairly simple job that you can do on your own.
A fluorescent light fixture that is not working or working well can be caused by several problems.
Fluorescent lights are commonly used because of their low operating cost.
A fluorescent tube that is failed or failing usually has darkened areas near one or both ends of the tube.