The note about the burial ceremony Edit
In the notes section, it mentions about using the Stargate as part of the burial ceremony. It says that the Stargate was activated without having entered an address, and so it immediately turned off.
I do not believe this to be correct, as the camera pans over the Stargate slightly earlier and we clearly see the chevrons lit up. Other episodes establish that after entering each glyph on the DHD, the corresponding chevron lights up. Thus it would appear that an address had been dialed, then the person simply waited before pushing the centre button to activate the wormhole. As for why it shut off so quickly, I am not sure but perhaps the person hit the centre button again to deactivate it.