No mention if the BIOS shows up so try this test. Unplug the hard drive and power up. If there is only a software issue you should see the BIOS screen show up. If no BIOS screen then it's time to try another video card.
Several days ago one of my monitors did not receive signal from the computer. I fixed the problem by going into video card settings and reactivating that monitor. Tonight, neither monitor recognized signal. The computer sounded like it went through the boot sequence, but no video signal.
I am running Windows 7 home premium. It is an nvidia quadro 1400 video card. Before the latest boot, I have been installing a large number of video preview files using Digital Juice software. The last time I was on computer, the Juicer software froze and I was to suspend the installation and close the program.
Not sure what to do.