Can you describe the flicker problem that you're having? I think mine might be doing that. It's not really noticeable unless you're looking for it though.
Also my mobo isn't outputting a signal to my monitor, is that normal? I have my monitor plugged into my graphics card.
It was basically faint horizontal bars that would flicker and scroll up, I could only see them if I was looking for them on a dark gray (not pure black or light grey) background, they only appeared if my GPU switched from idle clock to gaming clock so they only showed in games.
The problem was caused by trying to use an adapter block which you screw the VGA cable into which allows it to be plugged into a DVI slot, my brothers monitor has a direct VGA - DVI-D cable so the signal is converted properly, you can buy these cables on amazon but make sure that it will fix the problem, try out a similar monitor in your house if you can.
You don't really explain your problem very well, but I'll try.
Some motherboards disable the onboard graphics when you have a graphics card plugged in and require you to re-enable it yourself if you want to use it at the same time as the card, if your issue is that the graphics card isn't working that's most likely caused by not having drivers installed, some graphics cards require you to install the drivers before you can use it, I've never personally had this problem but some people claim they have.
If your issue is not related to those solutions then I don't know