Dwayne: but I was turning gray waiting for it to do my job
well, it's like trying do anything in Assembly language Thanks to any compilers like PICBasic.

Ioannis :Many thanks for the answers. But I cannot see the relations between ICSP (which involves RB6, RB7, MCLR\, Vcc and Gnd) and the clock of the OSCON. Though I will try to see what happens. With the F877 I never had any problem with the same configuration. It programs OK.
Well in this specific F819 that mean absolutely nothing. Everything is in the program device setting. What i was thinking is the programming method before i test the F819.

In many case, depending of your hardware or circuit design, you'll not be able to program this F877 PIC if PGM pin is not at least loaded with something. I've some pre-made F877 platform with an LCD on PORTB. In this case nothing happen 'cause PGM is on PORTB.3 wich is attach to LCD. This is what i was expecting for F819. But when i remove LCD from proto-board, PICstart,MPLAB return me errors. ALL are caused by interference with floating PGM pin.

Sorry for my bad assumption on this thread. One day i'll be better !!!