Capacitor is #1 suspect. If not, probably flash tube is dead after dropped or had another type of impact. Just replace the flash tube with something similar to

Capacitor is #1 suspect. If not, probably flash tube is dead after dropped or had another type of impact. Just replace the flash tube with something similar to this: https://www.ebay.com/itm/165491505983 https://www.ebay.com/itm/165491505983