morning I have tried the above and still no sound

A couple of things to try.

• Start up in safe mode and see if the speakers work, if yes then restart normally and see if they still work.

How to use safe mode on your Mac – Apple Support (UK)

• If still no sound try resetting the SMC (could take 3 or 4 repeats)

How to reset the SMC of your Mac - Apple Support

+1 to what Mal-S suggests.

I just chimed in to ask,

1. what does your Sound Preference show for Output?
2. does the Sound Output change, when you plug/un-plug headphones in/out of the Output port?