Hi, I just set up my Sente with digital marquee. When I turn it on using the bottom button, the Mini PC fan whirs and the mainboard diode blinks red then solid after a few seconds. The main screen displays "No Signal" and then goes to sleep. The marquee is black. The exterior LED strips do not turn on, neither does the Polycade logo on the front.

I recall plugging in the LED lights from the marquee to the main Sente before mounting it, as well as the power lead into the mainboard, and I double-checked the HDMI and HDMI-DP (from the marquee) connections into the Mini PC.

Thanks for any suggestions on what to look at next.

UPDATE:

I tried another couple devices with HDMI output (TheC64 Mini and the Super Nintendo Classic Mini). In both cases, I took the HDMI cable that was plugged into the Sente Mini PC and plugged it into the other device instead. I got much better results. Immediately, the display turned on, the sound started playing, the Polycade logo started glowing, and the LED strips activated, cycling between red, green, blue. Yay!

Except, maybe this means that there is something wrong with the Sente Mini PC? I'm unsure how to diagnose further. The power adapter is routed into the Sente and the switch is custom on the case. I can confirm that the fan to the Mini PC turns on and off with the switch, but obviously there is no display output. Help?

UPDATE 2:

I opened up the Mini PC and reseated the RAM and SSD, just in case. Then I plugged it back into the Sente and got a Polycade logo (!) on the display. It seemed to be booting! But then I realized I didn't plug in the marquee cable or the 4 USB cables, so I turned it off, plugged them in, and turned everything back on again. Unfortunately, something went wrong because nothing appeared and I'm back at a black screen again. I can hear the PC turn on, but there is no video.

I tried disconnecting and reconnecting, and I even tried the other devices again (that were working before), but none of them bring up anything on the display now. Maybe it's not the Mini PC after all. Maybe there is an intermittent connection problem with some wiring somewhere. I would like to check that but am not sure how.