thank you, but the problem is that I connect via a the tv hdmi using the adapter, the tv and macbook screens flicker but then the tv shows "no signal"...
Give this a try, it has worked for me brfore. With evrery thing connected an fired up, all other peripherals removed, try a pram reset:
Power down MBP, power up Mbp and hold the following keys before the start up chime:
option,command,P,R, (no commas), continue to hold these keys till you hear the start up chime 2 times, then release. Reboot and see if it resonds.