SPRO3 won't start - power light blinks after power pressed

[sharpuser]

Glad you got that sorted, @psavi . Will mark 'Solved' only after @kinselp finds the solution.

 

[Brian Octavianus]

I have similar problem, SP3 won't start up. I have charged along a night then tried all combination since hold power 30 sec. Then power + power up hold till 30 sec. It just show charger light blink once pressed the button, but the SP wont start up. Any idea to fix or faster solution?