Again replying to own post
I am begining to think this may be a power problem although I am not certain. Ive ordered a new supply unit from Antec - - a 750 true blue or something like that
The reason for my thinking this is that the screech seems to come from the 880 gtx graphics/vid card and I read somewhere they are power hungry beasts and display this sound when power loss is felt! I also watched inside the case when I tried the shorting of the switch wire and found that when the green power to the board light was on there was also blinking green lights over by the lan board connector - - -these would settle down to solid light then when I shorted the switch the thing spun over all the fans except the 880 gtx which just about moved! I also noticed the green lights were a lot dimmer like they were low on juice to them.Then I flipped of the power switch on the Antec and back on again and the dam thing fired up but with nothing on the monitor and also the screech from the gtx
I did this several times with varying results and even got it to run without the screech but still no video - - monitor stayed in power save mode
So I thought bad thoughts and said wtf I may as well try the power supply first and if it isnt that then new mobo
I may be way off base with this thinking but will keep posted in any event
This may well mean updating memory and cpu I guess so watch this space for next query regarding what to replace the mobo with
Asus Rampage formula III. WD Raptor 600gb sata hdd+WD Raptor 300gb sata hdd+plextor sata cd/dvd writer, 6gb crucial ballistix ddr3, intel i7 950@ 3.07ghz ,Geeforce GTX 285 vid card, creative x-fi, Antec true blue 750+Antec P180.