no cause i want multi boot system , have u got an multi image ?

I have just installed debian and recalbox , on pi 3 . As the debian boots correctly , recalbox doesnt boot at all and my monitor goes off while it boots , it means it gets no sygnal .
What should i do
Bellow my configs :
recalbox-boot.conf:

sharedevice=INTERNAL
global.videomode=default

config.txt:

uncomment if you get no picture on HDMI for a default "safe" mode

#hdmi_safe=1

disable_overscan=1

uncomment to force a specific HDMI mode (this will force VGA)

#hdmi_group=1
#hdmi_mode=1

comment to get jack audio

#hdmi_drive=2

Using /etc/modules is deprecated and no longer supported on 4.4 kernel

So manually enable audio

dtparam=audio=on

config_hdmi_boost=0

force hdmi while the tv can take time before sending the signal on the hdmi output

#hdmi_force_hotplug=1

uncomment for composite PAL

#sdtv_mode=2

uncomment for lirc-rpi

#dtoverlay=lirc-rpi

if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or give a low resolution because tv had no enough time to initialize it

boot_delay=3

uncomment if you don't want the rainbow at startup

disable_splash=1

Overclock

gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=512

#avoid_safe_mode=1
disable_overscan=0
overscan_scale=1
sdtv_mode=2
hdmi_group=1
hdmi_mode=16

any suggestions ?