dicobraz:
i have 4 leds in a circuit, each is wired trough 1/4 W resistor to its own digital pin, they respond, but not very bright almost unnoticeable.
To test the LED wiring and hardware, write a sketch that just turns all the LEDs on.
Each LED should have a current-limiting resistor in series with it. The important thing about the resistors is their resistance, not their Wattage. The required resistance would depend on how much current the LEDs require.