PaulS:
Serial.println("Begin Connection");
Serial.write(ledturnon, 24);
What is the fingerprint scanner supposed to do with "Begin Connection<cr><lf>"? You aren't really trying to talk to the fingerprint scanner AND the PC on the same serial port, are you?
Oh, so I can't send a command to my scanner with the board using my USB to Serial Adaptor as a power source? That was silly of me.
Ill get back on you once i tested it.