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When powering up, the detector goes through a short diagnostics test to make sure everything is working as expected. If there is a problem detected during this time, a message like the one you have displayed will appear. You should contact Beltronics Customer Support to arrange service with one of the methods listed at the bottom of this post.
A link to the manual for your radar detector is provided below:
You pressed the power button on top of the radar detector? If that doesn't work, first plug the smartcord into your cigarette lighter socket. Then plug in the RJ11 connector into your RX65 while looking at the power lamp on the smartcord. If you see the smartcord power lamp very briefly and faintly flash, then power is getting to your RX65 yet for some reason, even when pressing the power button, it won't power up. In that case, you have to send to Beltronics for service.
Regarding the problem of the unit turning on for a second, then turning off after you plug it in....
Plug it in and hold the power button down for 5 seconds. This resets the unit. The unit will still turn off after this however. After that, push the power button on again for one second and it should remain on. Good Luck!