Donkey Kong Grahical Error

squall280

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Just got a DK Machine and it is in pretty great condition. The monitor is VERY BRIGHT so i am guessing it was redone recently. Now when you power it up the graphics are a little off. like nothing that is really screwed up but liek donkey kong with be a little above where he stands and there is some flickering of the barrels and mario. weird thing is i turned it off and on again and on a few occasions it wasn;t there. is this a simple fix or something more with it. note: i am extremely new to this but annot afraid to attempt to fix it on my own with my limited skill set.
 
If using the edge connector on the PCB remove the harness and clean the edge connector. If not proceed to step 2.
Reseat the 2 ribbon cables located at the bottom of the board. If no fix go to step 3.
Starting with the CPU board, pull all socketed proms. Inspect for corrosion. If corrosion exists clean legs and reinsert.
If this procedure fails to correct your issue I'd suspect failing RAM on the CPU board.
 
i did everything you mentioned. hwo would i go about fixing the ram if that seems to be what is wrong?
 
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