PCB working but no graphics on screen

dyno

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Apr 11, 2009
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Lower Mainland, Britsh Columbia
Looks like i got my avalanche game some what working, the game coins up and I can hear the game sounds in the background but all I get on the monitor screen is raster lines scrolling. The monitor is an old black and white one. Any ideas what is wrong since the game seems to be playing in the background but nothing on the screen, I have tried to adjust the monitor with no luck.
 
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