Thanks for your replay.
Yes I tried that several times with no results. That is why I'm thinking I might have Bios chip problems or related HW ciruits.
It Might be also CPU issues as this ish the dreambox that has HDMI issue as well. I see HDMI output bootologo image only after the switch on but then just after duing the the image loding and also after the image is completed loaded I got "NO HDMI signal" and the HDMI stop to works. Only scart is working.