pole Position II recycles

starfighter2

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I worked on the game this weekend. It started out with just numbers an letters that would stay that way. Know I got it so that it looks like mame starting the game up. zeros, the all kinds of characters with a guy in the picture and RAM ok, Rom OK then a green ground, then it starts all over again.
I have a new Z80, changed the CPU board with a backup that I had for pole position (had to add two sockets). I have a pole position game PCB that works 100% an the AR boards and power prick has been rebuild 2 months ago so that is 100%. all voltages look correct.
Any thoughts on how to fix this?
 
try reseating the edge connector....i've gotten multiple boards working by making sure the edge connector was in the right position, running a switcher to the test points and reseating the chips.
 
I have already tried to reseat the chips and clean them and I have take of and put back on both the connectors and interconnect switch many times over. Do you have something more specific?
 
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