My ds lite does not boot without game cards

I have a strange problem… my ds lite does not boot without game cards (gba or ds does not matter ) but only boots with a game card is inserted. I checked the cables and did a IPA cleaning but same… add.to that; my working R4 card is not recognized by this ds lite… if an orginal game is inserted it boots. Another thing is ; during the game if i press select+start or xyab together there is frequency voice comes from speaker and freezes. Any advices are helpfull 👋