I recently bought a HDMI to DVI cable for my monitor which takes VGA input. It works fine with windows on laptop. In raspberry pi, it "blinks". The screen goes off and again the pre-built logo animation of the monitor. In ubuntu, the screen is sometimes supported, sometimes, it also "blinks".
Probably too late for OP, but try config_hdmi_boost=4 or even config_hdmi_boost=7. This tends to improve blinking issues.
You can change this by editing config.txt:
sudo nano /boot/config.txt - for more info see this.