android display not coming on dell monitor

[kiran nayak]

hi all
i just got my pandaboard and i tried to run some prebuilt images... on
the serial port it is booting fine but display not coming on the dell
monitor

i used the boot args as below
setenv console console=ttyO2,115200n8 androidboot.console=ttyO2
setenv memory mem=456M@0x80000000 mem=512M@0xA0000000
setenv rootfs root=/dev/mmcblk0p2 rw rootdelay=2 init=/init
setenv vmem vram="32M" omapfb.vram=0:16M
setenv display omapdss.def_disp=dvi omapfb.mode=dvi:1440x900@60
consoleblank=0
setenv bootargs ${console} ${memory} ${rootfs} ${vmem} ${display}
printenv bootargs
setenv bootcmd 'mmcinit 0;fatload mmc 0 0x80000000 uImage; bootm
0x80000000'
boot

i got prebuilt images from
http://www.omappedia.org/wiki/PandaBoard_L27.12.1-P2_Release_Notes#

pls help regarding this.. thanks