Icom 706 MK-II won't power up
 

My problem is that I have an Icom 706 MK-II, that won't power up.
When I push the power button I can hear a relay click in the radio,
and a thump in the speaker but that is it. I've checked the fuses
internal and external all are ok. . Does anyone have any suggestions?

Thanks in advance and 73's
Chafik CN8JV