Trying to use TV as PC monitor

Evening all

I've been after a solution to this problem for a while now, and it's beginning to bug me.

Trying to get TV as PC monitor. Graphics cards is NVIDIA GeForce GT 520 with VGA and DVI slot.
TV is BUSH IDLCD26TV22HD.

I have this http://www.ebay.co.uk/itm/330733437073?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 running from the VGA slot on the PC into the Y Pb Pr slots on the TV.

I have this http://www.ebay.co.uk/itm/270544205343?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2648 running from the audio slot on the PC to the Audio In on the TV.

By going into the Nvidia properties on PC (win7) I can see there are 2 things visible, the monitor and the TV. However, it's here things come unstuck. I'm unable to work out what to do next.

What do I need to change on the PC?
As I haven't (annoyingly) got the remote for the TV, and having looked at the remote picture online, access the Y Pb Pr facility?

Ta in advance for any asistance.
 
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