I've just got my phantom 1 out after sitting on top of the wardrobe for a while.
Fully charged the batteries and thought I'd be away, but no.

Did the normal start up procedure, throttle down, turn on controller, put battery into the phantom, await gps (flashing Orange).... But that's where it fails, I get a green light, flashing every second or so, I pull both sticks down to the opposite bottom corners, but no start up!! When I do that the green light does speed up for a moment.

Help please.

Mine is the same, then I disconnect the battery for a few seconds, connect again and away we fly ;) I don't know why is does this, but it works...

You never get the two red blinks indicating it's still looking for satellites?

I have never turned mine on and had it go straight to the green blinking light only.   Usually takes a couple minutes.

No sorry it goes through its normal cycle for s minute or so of finding satellites, then goes to blinking green.

Might need to go into the NAZA-M and run through a calibration.

Alex,
Did you resolve this?

Ah, so many come for solutions and then we never hear from them again.  Lets consider it as "no news is good news"

Yeah, it does happen a lot. I guess he is ok now...

calibrate is the best thing yet