Thanks for the reply! I did contact Athena last week and they kindly came back to me but apparently they no longer make the adapter and it’s EOL.

I will have a read through that other link you’ve posted, thanks a lot I am grateful.

Can I use any standard ATX power supply with the adapter cable on a Dell Dimension 4100 or is there a specific set of PSU's that I need to stick to?

sluml0rd wrote on 2023-10-26, 02:09:

Can I use any standard ATX power supply with the adapter cable on a Dell Dimension 4100 or is there a specific set of PSU's that I need to stick to?

Standard ATX psu with adapter should be fine...see this post for details Re: A Permanent Solution to the Dell 'Fake ATX' Power Supply Problem?

.legaCy wrote on 2018-05-05, 00:17:

I usually get a 20 to 24 pin ATX adaptor and rearrage the cables and there is also another molex connector.
Its is kind of tricky to remove the pins to re arrange but it is cheap and works.
Worked fine for me.

Can you share how this is done?