Hello guys.
I had a simillar problem, but it didn't work with any VGA.
It was in the multiplier/FSB setting.
The computer started, but the monitor did not start at all.
It was in the standby .
When I disconnected and again connected the case to the power it started usually. But not always.
If your system is not working, try to hold the power button on the monitor, it may run. I did it so and it worked.
And try to tune back the CPU settings to default.
I solved it out like that.
Hope you'll get the same result.