Game Input MultipleXer

I started Gimx over Bluetooth and everything worked and it opened the Terminal
the only things I could read were joystick not found: PLAYSTATION(R)3 Controller 0 and Timer fired several times....
the PS3 turned on but I cant controll it now :/
hope somebody knows an Answer

This means you are using a config which was made for a "PLAYSTATION(R)3 Controller", but there is no such controller connected on your PC.
You are probably using the PS3_LINUX_sixaxis_bt.xml config. It is meant to be used with a sixaxis connected over bluetooth with QtSixA.
You should try the PS3_LINUX_sixaxis_usb.xml config with a sixaxis wired to your PC.