hdtv as second display

Hello there!Guys could you please help.I'm not very good at computers.I have a laptop SONY VAIO ,CPU Intel Core 2 Duo Processor T8100 ENHANCED INTEL SPEEDSTEP 2.10 GHz,memory 4GB/Go DDR2 SDRAM,grafics NVIDIA GeFORCE 8400M GT GPU,BLURAY COMBO DRIVE,1080p.When i bought the laptop i had vista home premium and now i bought the windows 7 home premium wich came with 2 cd(32bit) or (64bit).Before when i had the vista i could connect my hdtv wich is a sony 40inch thru the HDMI and it would recognise it but now when i install windows 7 it doesn't.Oh by the way i did update the driver and i install the 32 bit version.I'm not even sure if i can install the 64 bit.Is not even working with tv out ( svideo ).THANKS

1) Did you install x86 or x64 version of 7?

2) What outputs does your laptop have?

3) What inputs does your tv have?

The best option would be hdmi.

My laptop got the hdmi and s-video and tv the same
i install the 32 bit version

Then connect an HDMI cable from your laptop to your TV, and adjust any settings.

I did and i adjust the settings several times but it doesn't recognise the tv.it's just show the main display.i pres detect and nothing.as i said when i had the vista it was working but now i dont know what to do.

What is the resolution of the tv and your laptop? Go into the gpu control panel and look at a setting for tv's.

What is gpu.how do i get there.what i did was go to control panel- adjust screen resolution and then i changed the resolution to several options still not see second display.just display 1.i tried detect but nothing

RESOLUTION ON THE DISPLAY IS 1280 BY 800 TRUE COLOR 32BIT DEFAULT REFRESH AND ON THE HDTV IS 1080p FULL HD.

In control panel look for nvidia control panel, plug in the cable and look at the display options. GPU is your graphics card. You might have to lower the resolution of the TV. Check the control panel.

I did look in control panel for nvidia control panel and i couldn't find it.