I have the mainboard Intel DQ45CB, with Intel express chipset Q45/Q43.
The mainboard has two digital connectors (one DVI-D and other DVI-I)
If I use only one monitor all run ok.
If I connect both monitors following things happen:
The initial Intel screen (where you can press f2 etc... does no appear, both monitors stay black until de OS windows 7 start.
After that all runs OK but if I dont use the PC from some time (10-15 minutes) both monitors go black and I can not restart. I need to push the reset button.
Some intel technical or someone can give me any solution?
Sorry for mi bad english.
Problem solved, if you want to connect two DVI LCD screnns to your mainboard (this model) you need to use the convertor DVI-I to VGA.