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lcd interfacing

hello everyone
i am interfacing 40x4 lcd to c8051f020 microcontroller
my circuit is fine and code is also working
i can display data from ddram and characters using cgram
but when i switch off the circuit and switch it on
i.e at the power on
my symbols made in the cgram are disturbed i.e they take some different shape
eg: i hade made up key arrow by passing first address i.e 0x40 and then 0x01,0x03,0x07,0x0f,0x07,0x03,0x01
arrow appears correct but at the power on it changes its shape
i increased the delay to 200 usec but its of no use
i am using first 2 rows for the display of symbols
so data and commands are related to first two rows only
i.e rw,rw and enb0 signals
problem is only at the power on
pls help me
thank you all
take care

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