Not sure this is right. Even assuming it IS an infinity is it an infinity with a beginning?
Given that it's being suggested as a possible explanation for why there doesn't need to be an uncaused cause, implicitly the idea we're considering is a reality which goes back infinitely, yes.
I don’t have a problem with an infinity, neither does the argument from contingency
It does - if something doesn't start, doesn't begin, how can it be said to be dependent on something else. If it's not dependent on something else, how is it contingent upon anything?
...but infinity has problems one of which I’ve covered.
Not that I've noticed, you haven't.
If there are 2 possible types of infinite universe, one with a beginning and one without we are faced with the question, why it’s one and not the other?
What makes you think 'why' has any meaning? It simply is. It is what everything else happens in, there is no 'why' to it. In order for there to be a 'why' there would have to have been something else occuring for this to be the result of, and implicit in the model is that that's not the case.
Secondly what is it that is infinite, If it’s energy you are suggesting, it is hence subject to the laws of thermodynamics, in which case it should have reached heat death an infinite length of time ago.
Thermodynamics is a property of this universe, we have no idea if it's a facet of the broader reality outside of our universe. Even if it is, our universe could be one of the 'eddies' of energy coalescing and condensing and the spreading over time that is part of that process.
What you are suggesting then is a perpetual motion machine. OK , so you agree that the universe can’t be a perpetual motion machine.
I'm positing that energy is, only the form changes.
So at the start of it, why did it start rather than not start?
What 'start'? There is no 'start', it goes back forever.
I accept no responsibility for any intellectual impairment on the part of readers If all energies were potential, a possibility in an infinity, then they are merely, as the name suggests, potential rather than actual so how could they interact?
'Potential' energy is still energy, it's not disappeared, it's just not in a form that we can actively use at that moment. Matter is potential energy.
If everything is merely potential then what is actual and can actualise?
You are conflating the use of the word potential in the phrase 'potential energy' with 'potential' in a philosophical sense - they are not synonyms.
It seems you are suggesting that something can come from absolutely nothing.
It doesn't. I don't have a problem with that notion, but that's not what I'm suggesting here.
O.