G4 cube an Sonnet Encore ST Duet G4

[Cktwo]

Hey guys,

I managed to obtain a Sonnet Encore ST Duet G4 1.8 GHz which I want to use in my G4 cube. The Cube until now was equipped with a (non Duet) Sonnet Encore ST G4 1.8 GHz, an Artmix VRM etc. and ran fine with this. The Duet however doesn't want to boot. Of course, I have installed the latest Firmware update from the Sonnet website (which seems to be the same for all Sonnet Encores, dated May-08-19) and reset the PRAM after the installation. However, I don't get a picture.

This is the card:


Any ideas what could be wrong? I doubt that it doesn't run at all in the G4 cube. I probably would fail if I hadn't upgraded the VRM, PSU etc. but I have done all that.

Thanks and kind regards
CK

P.S.: Yes, the Cube is equipped with LOTS of additional cooling, so it shouldn't overheat.

 

[macuserman]

What kind of heatsink are you using/how is it being held in place? Is it possible that it is not staying seated correctly after being installed? I'm not sure how you are securing it, but that could be part of your issue.