Hi Sundby,
Heres whats possible, I am assuming your a beosound 3000 is N.Music compatible (ie it allows control of the PC 2) and that you have Beo 4 remote, & a basic knowledge of stuff like option programming. i am also assuming that the content on your PC will play through PC2 ie its in the right format. Its also been a couple of years since I worked with PC2, so I,m not 100% sure the interface with PC might have changed slightly.
These products should be setup with the 3000 connected to Beovision 7 and PC2 via Masterlink. The loudspeakers connected to the beovision7 via powerlink. The PC connected as you suggest via DVI, and assigned to PC on AV 4 of the beovision 7. You have 2 choices for the transfer of sound from your PC to the Beovision 7.
1) connect the analogue output from the pc's sound card to the 2 rca phono inputs for AV4, or
2) use your DA converter to convert the sp/dif output from the PC to analogue and connect in the same way. Whether either way is better will be subject to experimentation.
You should also make an audio connection between your PC and the PC2 itself, this is analogue, it may be neccesarry to use a twin 3.5mm socket to single 3.5mm plug adaptor to achieve all this.
You cannot connect the spdif directly to the beovison 7 as it cannot process stereo digital signals!
Unfortunately you cannot acheive complete control with beo4, the reason for this is that even if you activate the PC2 using N.Music, the software will not open up on the display, you have to use the mouse to open the righthand control bar, select N.Music, and then open the left hand navigation bar, once this is open you can revert to using the Beo 4, and you will be able to see the navigation on screen.
In order to be able to switch the screen independently of the pc2 you will have to go for a non standard option setting. Put every thing in option 1 including the PC2. Ok you will need to add a couple of list functions to your Beo 4, firstly AV, secondly A-N.Mus.
To operate the tv/dvd use as normal. To bring on screen for PC use PC from list (add if neccessary) with the screen on activate A-N.Mus which will start the PC2 software but will leave the screen active so that you can use mouse and see navigation.
When you are ready to switch off the screen press LIST scroll to PC press GO and then standby, the screen switches off and leaves you with the sound of the PC2, re activate A-N.Mus to regain control of the software. Alternatively you could just use the P.Mute function to temporarily switch off the screen.
The problem with this is that in order to access normal CD and Radio functions you will need to prefix the commands with AV, so turning on the radio will involve LIST scroll to AV press RADIO,
If the remote commands are sounding a little OTT you might consider a Beo5, as these chains of commannds could be put under one button, which would clear everything up apart from the mouse being needed to see navigation on screen.
Hope this is useful
Beocentre