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Dual monitor help

7 Mar 2012
hey guys

am having trouble with my duel display on my graphics card.

i have 2 monitors Viewsonic HDMI 1080p and a HP W227h i wanted to duel these to screens up but having difficulties.

So i first plug in my Viewsonic Via HDMI to the back of my graphics card everything is fine and monitor is on,
then i try and plug my other monitor in using HDMI to DVI-I converter.
every time i plug this in it turns off my viewsonic monitor giving no signal untill i unplug the HP DVI-I connector.
ive switched these around so the HP is using the HDMI port and the Viewsonic using the DVI-I port but it does exactly the same with only 1 being on at a time
ive reinstalled windows even changed my graphics card from a GTX560TI to a Radeon R9280x but does exactly the same.
ive had it running great for a few hours untill i restart the pc then back to its usual tricks but not getting any joy anymore
i have also tryed to plug in my tv to it and it does the same thing

Radeon R9280x
asus m5a78l-m

Any help is greatly appriciated