White Screen

I have an mini 2440 with 1gb NAND flash.Till recently it was booting from
NAND flash and i could use qtopia that was already installed.But suddenly
when i tried to power on the device with the NAND flash in operation i can
just see a white screen and nothing else.

I do not what is the reason for it. What is the problem and the solution to
this ?

Work your NAND/NOR switch several times to make sure it is sliding well.

Check the FFC connectors on the LCD and Mini2440. The blue part of the
ribbon should have about half its length exposed and be exactly square in
the FFC connector. Remove and reset (lift one end with a thumb nail) the
oval FFC/PCB LCD connector on the Mini24440.

Try again with a terminal like DNW or hyperterminal attached to the DB9 to
see if the full Linux boot takes place.

i removed and connect back the bus from LCD and Mini .Still i see nothing
other than the white screen when booting from NAND.