Serial monitor fails to send character to pro mini

Development Tools IDE 1.x
1

The serial monitor fails to send a character to the arduino pro mini from the serial monitor when asked.
Exact same code works perfectly on arduino uno.

Pro mini upload works fine, pro mini serial monitor works fine, BUT the RX led on the pro mini won't even blink when send is pressed to send data to the pro mini over the FTDI usb to serial cable. I am stumped.

Any ideas?
updated to the latest FTDI driver, but no difference.

One clue is that a program that only loops to check for serial available works on both the pro- mini and the uno.

The larger program only works on the uno, the serial monitor fails to send a character to the pro mini.

Thanks

2

dmacfarland:
BUT the RX led on the pro mini won't even blink when send is pressed to send data to the pro mini over the FTDI usb to serial cable.

The Pro Mini does not have a LED on RX.

3

Thanks srnet.
It's a self rolled board with rx tx leds, that programs as pro-mini.
5v 16mhz atmega 328

4

duh pin conflict