Hi John,
Thanks for your help, was told by cust that set went pop, so foolishly headed straight for power supplies without checking the screen - well it was face down on the bench. After replacing both P/S to no effect thought to look for a picture. Found one, rather washed out and snowy. Checked fuses discovering FS1 (4A T) on Z-Sus O/C. Replaced fuse and was rewarded with sparks from under the central heat sink.
Replaced Z-Sus - OK Many cheers for local council tips, long may they recycle.
Hi Spiceylad - Haven't the RCU myself, but mine comes on when plugged in.
Thanks all - Chris