If you are getting the message "no signal" this would indicate that there is a problem with the signal from your dish into your box. Even without a card inserted into a SkyDigibox, if there is a signal, you will always get Sky Guide and the free channels.
Try powering off your box, remove the card, check carefully the cables, especially the connection to the dish, reapply the power and then when asked to insert your card you should then be able to see (for example) channel/SNWS">Sky News on 501 and the BBC News channel on 503.
Once you can see any channel, reinsert your card. This should, after about one minute, give you the channels you expect, such as 103, 104 and 105.
If you continue to get "No signal", you dish may have been misaligned, or there may be a fault with the cables and connectors, or a problem with the Digibox. You can see the signal strength by pressing SERVICES, then 4-SYSTEM SETUP and 6-SIGNAL STRENGTH.
To get HD on the Sky+HD box means an extra subscription charge which we are not prepared to pay for something that makes so little difference to our viewing, especially as there are still few programmes transmitted as HD - most being in SD even though they may be on an HD multiplex. Then as we have access to the HD services on Freeview that we can watch for no additional cost there is no incentive to pay more to Sky. Plus the YouView box provides HD services as well and as we are not paying the £3 extra at present (part of the compensation) then there is even less incentive to pay Sky. So taking all that into account there is no benefit from the HDMI connection for the Sky box, especially as that makes it more confusing for a non-technical family member (the wife) to get what programmes she wants to watch. (The LG does not automatically switch over to the HDMI input when the Sky box is turned on but it does when we use the SCART input, so that is easier for her).
I understand that these smaller boxes are what BT supply unless someone wants the + version for recording/playback features. I looked for information about this box on the web but have only found stuff about the PVR versions (or an Icecrypt device that is totally different!). The supplied 'User Guide' is, as usual, pretty poor for any technical information but does give basic details of how to connect it up. I'm fairly sure this box is what Patricia has as it's the norm for those taking the BT TV Starter option, the PVR boxes cost extra. It would have been nice and helpful if we heard back from Patricia, but as we haven't we can't be sure.
BTW, the TV is an LG 32LB585V-ZM that has Freeview HD, satellite HD, 'Smart' features, etc. On the satellite section we get all the non-encrypted services including the HD ones and not just the Sky provision. Despite what the 'technical support' at LG said, it gets the programmes from all the satellites at orbital positions 28.2 and 28.5 East (as that's where the 60 cm dish is aimed) so includes some non-UK channels as well.
We're quite pleased with the TV set, good picture, easy to use once set up suitably for our needs, but waiting for the sound bar to be delivered so we can better judge the sound quality (the tiny built-in speakers are rather 'tinny', especially for music).
MikeP: Yours is the Currys version of the 580, which I really like. Great motion processing for a 100hz screen, and good value for money. Yes, its a 32in screen, so no great shakes in the audio dept, but like you say, a decent soundbar could sort that out. Its got ARC, so an HDMI soundbar would be great, but I think that LG's 320w and wified sub N3540 is great value, and not too long to fit with a 32in.
Its an interesting point about Sky - I'd heard that you still got the BBC HDchannels,etc, no matter what - can anyone confirm that?
MikeB: Although your BBC HD channels query might be in connection to MikeP's satellitescan on his LG, but purely for information purposes one of the boxes I use is a Sky+HD box on a non-subscription basis, but with its hard drive having been disconnected as it serves no purpose when the box is being used in this way. My other reason for having done this being for purposes of acoustic noise level reduction as well as an element of electrical economy.
When the box is being used in this fashion, the only HD channels I have found possible to view are all with a BBC tag attached to them, e.g: BBC1-2-3-4 HD including CBeebies HD / CBBC HD / BBC News HD, other channels being: ITV1HD inc+1 / Ch4 HD / RT HD / NHK World HD, no others being possible that I am aware of.
I can confirm that the only HDchannels I can watch on the Sky+HD box are the PSB ones, none of the commercial services are available for viewing. They are shown in the 'Guide' but in a different colour and selecting one brings up a warning that to watch this channel you need an HD subscription.
As I can get all the channels I want on HD via Freeview or Freesat I personally see no value in the expense of an additional subscription fee to Sky.
MikeP: & JB38: Thanks guys, you answered my question! I'd read some time back of former Sky customers with HD boxes complaining that Sky blocked the HD channels, even the PSB ones, and Sky changing their policy (after the media got involved), so the PSB ones could be viewed. I just wondered if that had actually happened. Seems it had.
MikeB: I have never at any time found PSB related HDchannels to have been blocked, although considering that HD channels received on my Sky+HD box are exactly the same as obtainable on my Humax HD Freesat PVR, I may decide to reconnect the hard drive on the Sky+HD box and just reinstall my standard Sky box, as many of the channels viewed by my family on the Sky+HD box are only broadcast in SD anyway.