CCA, your topic says classic and 400 help. They are a bit different, firstly (as I remember it) 747-400
If there was no hydraulic power on the a/c, but there is pneumatics and electrics, if you were to move the flap lever to say flaps 10 nothing would happen initially with the trailing edges, due no hyd, 1st leading edge group should deploy, after 60 secs it works out that the trailing edges haven't moved and they automatically go to electric mode and star moving with an associated EICAS of FLAPS PRIMARY, I think, when T/E's are at 5 2nd L/E group should go. If you had no pneumatics the l/e's would do the same after 60secs but I think they all come out in one go, With an EICAS message.
Classic, now I'm having to trawl deep, I think! You can move the flap lever with no hyds and nothing will happen to the trailing edges, 1st group of L/E's won't extend until T/E flap signal is FLAPS NOT UP. You would then have to arm the T/E's alt sys then select the inbd and outbd groups to down. And stop them in the desired position. Leading edges would then go in the normal sequence.
I'll have a look when next in work and edit this if needed. Hope it helps anyway.