I bought a PSGO GT. Followed the guide and verified the latest update is installed. This is the SLIM model.
1) Update the PS3 into Firmware 3.41 (was on 3.40).
2) Unplug the power cable
3) Plug in the USB Key
4) Plug the power cable
5) Press eject button
Then the PS3 turn on, beep 3 times and the fan runs extremely loud, however the light on the P3 GO does not flash. After a few seconds the PS3 shut down by itself.
I tried both USB ports, nothing else connected. I tried the update.bin as well as using the new psgroove.hex method. Also verified the firmware is indeed 3.41. PS3 works fine without the dongle.