So i'm going to try the socket technique for starters on this next diode if i cant get the current one working. I think my problem is that i was using pliers at first to try and press it in myself which might have broken the connection.
If you would like, you could package up the diode in the heatsink and prepay shipping both ways and I could drop it on my PSU to see if its the diode or not. You could even send the driver and I can see if it is the issue or not also. It wouldn't take me more than a few minutes to test so I wouldn't mind. Its up to you.
Yes I know the batteries weren't dead as I had just fully charged them. And you are right. I will keep you guys update tomorrow when I attempt to fix it.
What batteries are those? I don't know that 3.4v would do that but if they don't output enough current to drive the laser maybe that could be the issue. A single 18650 does power my Blue Ice but not at full power.