DJM 900 SRT Dont Start

 Hi there!
 
I have a problem with my djm 900 srt when i start it doesn't work...
Only the botton of LFO form and wake up botton flashes 3 times and then stops, then again flashes 3 lights  and doesn't work.
It doesn't fail everytime... sometimes it works as it should... other times doens't work at all... so... I really doesn't know what's going on... I know for a fact that should work every single time... 
So... my question is... what's happening...?
Need some guidence here...

Thank you for your time... and waiting for you most valueble answer...

EG