Laptop to LG TV through HDMI Cable

hi all,

my dell laptop model is Studio 1555 Service Tag: 57JZ7K1 , i have a LG 32 inch HD tv. Im connecting my laptop and tv using HDMI cable but, i dont see anything in my tv.
i have another lenovo laptop i connect it with my tv and its working fine.

i have downloaded DellSystemDetectLauncher.Application from dell.com but, i got exception as "Application cannot be started . contact the application vendor"

from desktop, i did right click 'screen resolution', from display i could see "lg32" when i select and click ok then my laptop restarted. i tried the same many time but, it keeps on restarting but, no display comes on tv.

So, i tried download driver but, i unable.

i tried to setup display but, its also not working.

can you please help me to resolve the problem...please...