Hi Dan,
thanks fro the tip. however that did not help. I've tried everything I can think of by now:
remove all expansion cards
disconnect ssd/hdd/odd
recovery jumper
B2B button
cmos battery
on the right of the processor there are couple of led's these light up slowly and go off slowely while the system is poweron. There are six of those. I noticed that only 4 of them are 'blinking' is this correct behavior ?
thanks
Robert.