OK, I checked the fuses and they (7 of them) are good. The flashers come on and all but one bulb is good. What now? How do I check the switch in the column and the little silver relays?
The flashers come on, is that your emergency flashers? What happens when you just have the left turn on and the right turn on? Do they light up but not blink, do they not do anything? I would still lean towards a bad flasher, specially of they were just working before.
You also might want to clean the connections the bulbs sit in and make sure the contacts are contacting correctly. If one bulb is out normally that side wouldn't flash.
Also, if you have a multimeter, get a reading at the flasher, if you are reading voltage, then it would be safe to say that your turn signal lever switch is working properly.