12.10 Install - Monitor keeps turning off and ON

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http://askubuntu.com – Installing 12.10 Desktop x64 bit on a Dell workstation with NVIDIA Quadro FX1500 connected via DVI to VGA Adapter to a Dell 19inch monitor. Setup boots fine and install progresses but during the install and after logging in as well, dell monitor keeps going off and on like switching or going away and coming back .. any ideas ? will be grateful ! (HowTos)