How connect My Sony Viao laptop to my Panasonic Vieirra tv

[BeeBee 15]

My Sony Vaio laptop used to connect to my Panasonic Vierra tv very well. also 2 others.with an HDMi cable Now all I get is nothing but a connection noise from my laptop. I have bought a new HDMI cable,but nothing. again I recently purchased a VGA monitor SVGA M-M15 pin cable as the back of my tv has a 15 pin socket for a pc.
This does not work either.Totally lost !
Anyone any simple ideas ? Please not too technical or jargon.
Many thanks

 

[C12Friedman]

How is your laptop's display? Does it show any lines, waviness, pixelating or other anomalies at start up, does it work at all?

 

[BeeBee 15]

No problems with my laptop