Toshiba A8 to Lg plasma

[Dinks]

i recently tried to connect dad's laptop to his plasma LG 40" 768? resolution panel. set the laptop to the same 768 resolution used the function F5 key to change to what should be a plasma screen going by the icons on the laptop and changed the LG to the correct AV input but all I got was a blank screen. no matter what i tried, changing the resolution on the laptop, different functions on the laptop, playing with setting on the LG, i was unable to get anything other that a blank screen.

would i be correct to assume that the video card on the laptop is unable to power the plasma.

Mobile Intel® 945GM Express Chipset

Tecra A8, Mobile Intel® Core®2 Duo T7200 Processor
(DC2 2.0GHz, 667 FSB, 4MB L2 cache),
Genuine Windows® Vista Business
Mobile Intel® 945GM Express Chipset,
100GB (5400rpm) capacity SATA,
1GB DDR 533 expandable to 4GB (1 slot used),
15.4” TFT Active Matrix XGA 1280x800 resolution,
Intel® Graphics Media Accelerator 945 UMA up to 128MB,
DVD SuperMulti Dual / Double Layer, One Type II PC card slot,
SD slot, RGB, 3 x USB 2.0, Serial port, S-video, 1394,

the laptop is six months old and when new i connected it to an 19"lcd for him and it worked a treat.

cheers
Robert