Problems with secondary display

[elad333]

I bought a new computer and install 2 os ( 7 and xp pro )
After some tests I notice that the secondary display on Clone mode have a single horizontal stripe ( it always on the secondary display).
When I'm using just 1 monitor dvi or hdmi (from onboard) in separate all is good
But when I'm using clone mode the secondary output gets that horizontal stripe.
Another problem is :
When I'm using 1 screen and turn off the comp then I connect another screen and boot up the computer, the screen picture is distorted and I can't see a thing just lines and colors, I need to configure clone mode when the computer is on and then I can regular boot up without problem accept the strip problem that is still there….. ( :
I replace the mobo and still the same problem
I install new os ( win7 ) on deferent hdd and still the same problem
I run the test from xp and from win7 and had the same problem…..
I update the bios and download the latest drivers
I test it with lcd monitor and tv screen and with 2 lcd monitors
i suspect the cpu but everybody say is really rear that the problem is from the cpu
please help ………………………………………
"Asus p8z68 –v –pro
thermaltake toughpower xt 650w w0227ru
G.SKILL Ripjaws Series 8GB (2 x 4GB)
i7 2600k"

 

[elad333]

recently I change the cpu ( with the same parameters ) but I still have the same problem above