Trouble shooting will need to be done with the test button on the flash, with nothing but the power cord plugged into the back panel.
First, with the light unplugged, check the flash tube on each. Make sure there is no visible damage to it.
Also, using a clean cloth or tissue, press in on the flash tube to ensure it is fully seated. Especially make sure the trigger leg (the by itself) is is straight and not bent. This can happen if one is not careful mounting or unmounting softboxes or other modifiers.
Once you have ensured this, plug the light in and try again. If it works and the light does not make an unusual "ZAP" sound, you should be fine.
If you get teh ZAP sound, or it is still not working, unplug the light and let it sit for about 10 minutes. Again using a cloth/tissue, remove the model lamp and remove teh flash tube. The model lamp unscrews, and the flash tube pulls straight out, though rocking it may help.
Once removed, inspect the legs for any charring. Black inside teh glass is fine, but not on the metal legs. If the legs are charred, The tube has arced and the eyelets inside the light are also damaged and the light will need to be repaired. If the legs are charred, replacing the flash tube may work for a short period, but it will also get damaged.
If the tube looks OK, it could still be a bad flash tube. Swapping the tube with the good light or a new tube can verify this. If a known working tube still does not work, then there is a fault in the flash head.
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