GRT Avionics

Suddenly my HX won't boot up. Screen says "Operating System not found" (or something like that).
Any ideas?

Here's a summary of our phone conversation:

Disconnect all USB devices and try again. If the processor settings aren't correct, the processor may think a USB drive is a boot disk. Some devices can temporarily look like a drive, but that is rare.

If clock power is connected, a low voltage event may have left part of the processor in a bad state. Disconnect all connectors from the HX and let it completely power down for 10 minutes. Then try again. This problem normally causes a different boot error but it's worth a try.

If the system still won't boot, there must be something wrong with the internal storage or the connections to it and the unit will need to be sent in.

It's on its way to you.

Jeff found something internal had come unplugged. Fixed it, added a retention clip to keep it from happening again. And, turned it around in one day. And, sent it back, no charge - on a 7 year old unit. A+ customer service!
Bob