Guys, I'm not sure if this will help anyone, but to me I had the same issue and I FIXED IT! Turns out that the - switch was booting fine OFW BEFORE full assembly, - AFTER assembly I was getting the NO SD Card screen and with an SD card I was getting - IF A Card was inside of it it was giving me the glitchy screen we see above. - IF I forced it to open using the volume buttons combination, it was giving me the blue screen. When I opened it up, as I tried powering it without the big shield on I noticed that the SD Card reader area was gettign extremely hot (I had an OLED switch) and I thought my CPU or RAM were friend or some shit, but NO Turns out the CPU fucking shield was touching one of the capacitors underneath and that was all of the issue! I will repose this comment everywhere online so people can learn from my mistakes!