if all the other three are LED and are working ok and its just the front right, which is a standard one, that isn't working, it suggests you have pulled the cable a bit too hard and unplugged it further up the line accidentally.
If it was an LED one, I would have said try plugging it in the other way round as you may have accidentally reversed the polarity and LEDs' only work one way whereas normal bulbs don't car which way the volts go.
