I am currently running Windows 8 on my rig with a 290 and two 290x's.  I use a variety of miners depending coin I'm mining along with MSI Afterburner for easy overclocking control.  I use Logmein to control remotely, however when I unplug the monitor that I have connected to the 290, the system freaks out and becomes unstable/unmanageable.  I would like to keep the same setup I currently have just minus the monitor.  Any simple fixes I can try?  I'm fairly ignorant regarding many of the programs/techniques used in mining(learning everything slowly) so please be detailed with your help!

Thanks