cmj Posted June 4, 2021 Share Posted June 4, 2021 (edited) Hello. I recently obtained an Atari 400 labelled as "working". Upon setting everything up, it will only display a green screen. Every time I turn it on, it only displays a green screen. Where should I go from here? What are the most likely causes that I should investigate? Some more info I forgot to include: 1. A green screen is displayed 100% of the time so far. Never a black screen / anything else like some other posts I have seen. 2. I have tried inserting various cartridges, however something is wrong as carts do not click in all the way on this machine (tested and work fine on my other 400). So, I am not sure how to test other functions of the machine using carts until I can figure out this problem. 3. I have used the power supply with another Atari 400 which works fine. Edited June 4, 2021 by cmj Clarification / steps taken so far Quote Link to comment Share on other sites More sharing options...
eegad Posted June 6, 2021 Share Posted June 6, 2021 I had the same issue with my 400 after it had been stored in a closet for 25 years. Turned out to be the RAM card. Bought a replacement off ebay, swapped it, and it booted up just fine. Quote Link to comment Share on other sites More sharing options...
cmj Posted June 6, 2021 Author Share Posted June 6, 2021 I opened up the machine last night; turns out all it needed was for me to reseat the RAM and CPU cards. Working fine now 2 1 Quote Link to comment Share on other sites More sharing options...
Sugarland Posted June 6, 2021 Share Posted June 6, 2021 Very likely happened during shipping. Good catch! Quote Link to comment Share on other sites More sharing options...
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