Running Janome Memory Craft 8000 Self Diagnostics?

I keep getting Overload problems, no messages or error numbers, just Overload.

I've tried the test by holding down the up/down, the reverse and the start/stop buttons at the same time and followed the self test procedure. I get 2 plus signs to press on, then a light in the Decorative section (69-116) so I press on that, then a few more plus signs, then it says self check done.

So I turn off the machine, wait for a while, turn it on again expecting it to do a self test, but it does nothing, just sits there in the "ready to sew" mode, I press the pedal and guess what, Overload.

Anybody got any ideas please, is my machine d e a d, had to spell it, it's sitting behind me listening.

Here's hoping.