pc to hdmi tv not working no signal

[clark12]

i cant connect my pc to my hdmi tv today but before it runs smoothly i tried connecting in my other laptop and works just fine what could be the problem here

 

[nzalog]

Could be a few things. Too high resolution or refresh rate going to the TV. Try lower those and if none of that works try a different cable or HDMI port.

 

[clark12]

its a direct PC to HDMI since i dont have a computer monitor it works fine before i dont remember changing any settings
can you please give me some instructions how to do it
i have a sony bravia EX430 1080p and geforce gt240 GPU thanks