I've got three endings to this so far.
1)
ZOMG Spoiler! Click here to view!
Went and got the video, watched the video, got the key, went through the door
2)
ZOMG Spoiler! Click here to view!
Opened the fireplace, got the fuse, got the video, watched the video, went upstairs, answered the phone
3)
ZOMG Spoiler! Click here to view!
Opened the fireplace, got the fuse, got the video, watched the video, got the key, opened the door, went upstairs, answered the phone
The difference between the last two isn't huge:
ZOMG Spoiler! Click here to view!
The person on the phone says different stuff