OK, you seem to misunderstand the HDMI thing. If you have component (HD- Red/Blue/Green) outputs on the Sky box (mine doesn't and I don't thing many HD-capable boxes do these days) then those connections will/may be disabled if you use the HDMI to the TV. But in your case you are using SCART to composite (an SD signal) to the slingbox, which is not affected by the HMDI. So that is all a red herring and not related to your problem.
You say you get a 'weak or no video' message if the Sky box is in standby. That is exactly what I would expect, but I must admit I haven't heard of the 'Active standby' because when I tap on the power button on the Slingplayer remote it wakes my Sky box up and everything works. But my box just goes into an ordinary standby mode.
I can only assume there must be something in the Thomson box setup menu option to disable that option ?
Later: Select Options and Sky+Setup and it is the last entry on the screen.
Thank you for your prompt reply
Will look again at the problem and revert
From: alanrichey42 firstname.lastname@example.org
Sent: 24 November 2010 20:47
To: ADE ODUNSI
Slingbox Answers Forum<https://community.sling.com/index.jspa>
SLINGBOX SOLO AND SKY HD BOX CONNECTION PROBLEM