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I've an Atari 400 that I had apart and late one night decided to install a UAV board. I then connected the power board, inserted the CPU and RAM cards, then powered on. No video signal. I checked over my wiring to figure out what I had done wrong, but the wiring was all correct. Then suddenly I realized something, with the sinking feeling as I would imagine someone might have when they hear the scraping of the belly of their airplane upon a gear up landing...I had installed the cards backwards! I know what direction they're supposed to go, but had a lapse of attention at some point. I quickly powered off, turned the cards around, and tried powering on. This time had a video signal, but a blank screen. All I can get now is a blank screen, or once in awhile, a green screen. I've checked power and signals everywhere I can think of, but everything appears to be good. I eventually figured out that all the ICs are good and it's not the power board. The problem is definitely a component on the main board. Power looks good at all cards and ICs (+5V, +12V, -5V), the frequencies are good, the O2 signal looks great at all appropriate locations, the CPU SYNC is going, address lines are all active, CAS and RAS are active on the RAM. I can't figure what where the problem is, but it's definitely one of the mainboard components. Anyone have any idea of what I might have fried that can cause this? I forgot to add, there's also no activity on the SIO. Fortunately, this was my own Atari I was working on.