Remove the pic and turn the power on  ground RB4 if
led worked  then you have a software problem if it did't work
then reverse the LED if it did't work again then check the resistor value
with miter.

Andre


>
>  Greetings,
>
>  my led won't lit up too. i'm using pic16c84. the code run well in
> simulator,
>  but not in circuit. is there any problem with my circuit ?
>
>  ** please select variable width font. thank you. excuse my drawing :)
> my first
>  ascii circuit (and pic project too )
>
>  configure to use RC osc, clear RB4 to sink current, thus turn LED on.
> can see
>  the PortB clear bit 4, TRISB is correct (all in mpsim). yet , in real
> circuit
>  it doesn't :(
>
>  regards,
>  ckchan