Hi Paul. Welcome to justanswer.
Does your TV has an HDMI port? And by hmri cable do you mean HDMI cable?
Does your laptop have a 15 pin VGA port?
That is an automatic offer. Please ignore that. Does your laptop have a 15 pin vga port. I will attach image if you are having nu confusion
Check this image
Yes I meant that only. Are you using HDMI to VGA cable?
So you were using HDMI to VGA (15 pin) cable, right?
Paul you will need to buy an adapter for mirroring the laptop to your tv. It is available to £5.
CLICK HERE TO BUY
Connect one end of your monitor cable to this and other to your TV and you will be good to go
Remove any other input from your TV
Which OS is there on your laptop? Windows 10,8,7 etc?
What exactly are you seeing on your TV? Any colored lines?
Make sure all the connections are tight. Try switching the VGA cable's male end from the TV and to the adptor.
Press the Windows logo on your bottom left of the screen
Choose Connected Devices.
Click Add a Device.
Open justanswer.co.uk in your browser and log into your account. You will get this conversation there
Did you go to the settings on your laptop?
Remove the HDMI port and then again go to Settings