what ram is showing bad? or is it random? I can't suggest what to do next unless I have numbers.
It appears one of the RAM i bought is marginal. It boots with no issues, but the burn in test would thrown an error like this after a minute or two. The error would follow the bad RAM around the socket location when moved.

With the second RAM I bought I was able to run the burn in for an hour or two with no problem. Later, I tried to run burn in again and it locks up on the second service screen with this colored pattern moving up the screen. Controls and service buttons inop and no error codes on the LED (0 displayed0) if I reset, it will boot and seems to work in attract mode, but locks up in service mode every time.
Need to go to work, but will likely try moving the new RAM to a different location to see if behavior changes in any way. Then move it back to the current location and see if the same behavior returns.
Might be unrelated, but the screen seems to jitter up and down periodically. I was going to post a video but it stopped and didnt have time to wait for it to come back. Im not sure if it is a sync issue with the monitor, or glitches in the signal. Tonight I'm going to put a scope on the video signal to see if there is any jitter in the sync signals.
Thanks for the help!









