So sorry to hear that, it does indeed feel very bad when a laser dies, especially when you have got it recently.
I dunno if there are any methods. If you are lucky, it is just something about the electronics inside the laser. But if it was the LD that died, I find it VERY wierd that the heatsink wasn't warm!
![Frown :( :(](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f641.png)