

If your monitor is currently connected via HDMI, and supports any other type of cable, I would try any other type of cable.
I have had similar issues when the Digital Rights Management (DRM) layer of HDMI was having timing issues, causing a blank screen.
In my case, it would sometimes work, if the power up / wake up / boot up cycles of the monitor and CPU happened to align, but on certain of my PC builds the timing tended to not match up during most boots, and I usually got a blank screen.
Edit: Oh, and classic advice for the ages - when I have the monitor hooked up to a graphics card, I switch it over for one boot and see if that fixes things long enough to pull some log files and get more info.




And counting!