I have a Z68 Extreme4 with an i7 2600K and Win 7 64-bit. I use the internal GPU and the screen is connected to the displayport. Sometimes when i switch from one user to another, the display signal disappears when the logon screen should showing, forcing me to reset the computer in order to get the signal back. Sometimes that does not help (still no signal after warm start), so i have to power Off/On in order to get signal. This can happen both when i run single monitor and dual monitors. Anybody else have this problem?

I also have a problem when running dual monitors. If I by mistake turn off the main monitor, then when i turn it on again i have no signal and have to power off the computer in order to get signal again.