128240A 1/128 duty graphic - LCD still dark


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eng. Mohammad Diss

please i have 128240A 1/128 duty - graphic display after setting as following

;graphic home set;graphic area set
;text home set;text area set
;or mode ,internal cg rom mode
;mode set lcd on curser on and blink off
; cursor 1 line ;set cursor pos at 0,0
;address pointer set to text area address 5000h
;write 21h "A charecter" at all area

it is still dark
not display any thing
what is the problem