Gracias por tu ayuda, pero no consigo encontrar esa linea en el "config.txt" te pego aquí el contenido de dicho ".txt"
block in MHz (default ?)
#dtparam=sd_overclock=75 #Clock in MHz to use for MMC micrSD (default 50)
dtparam=audio=on #Enables the onboard ALSA audio (always use this ON)
dtparam=spi=on #Enables the SPI interfaces (default OFF)
temp_limit=80 #Overheat protection. Disable overclock if SoC reaches this temp
initial_turbo=60 #Enables turbo mode from boot for the given value in seconds
hdmi_drive=2 #Normal HDMI mode. Sound will be sent if supported and enabled (default 2)
#hdmi_ignore_cec_init=1 #Avoids bringing TV out of standby and channel switch when booting (default 0)
#hdmi_ignore_cec=0 #Pretends CEC is not supported. No CEC functions will be supported (default 0)
#hdmi_force_hotplug=1 #Pretends HDMI hotplug signal is asserted (default 0)
start_x=1 #Enable software decoding (MPEG-2, VC-1, VP6, VP8, Theora, etc. default 0)
overscan_scale=1 #Video Output will respect the overscan settings (default 1)
disable_overscan=0 #Disable overscan configuration. Set 1 if you see black lines on TV (default 0)
disable_splash=1 #Avoids the rainbow splash screen on boot (default 0)
#avoid_warnings=1 #Disable warning squares (Red=over-temperature ; Rainbow=under-voltage). (default 0)
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=256
que pertenece al Os "aikoncwd-rpi-mediacenter-master"
a ver que encuentras aquí