Are your monitor drivers updated?
They could be a real problem if they aren't properly updated with the latest drivers.
(I'm kidding, there's no such thing as monitor drivers
)
Have you made sure all the power plugs are in? (ie: monitor power plugs, graphic's PCIe power plugs)
When you say the drivers are up to date: did you install the video drivers correctly? (
YES there
IS a way to install video drivers)
NEVER, EVER, EVER, (get the reference?) use converter blocks - high end PC's such as yours are supposed to have the actual cable.