If your display is blank and not detected by your host computer follow the below troubleshooting steps:
1: Ensure that the iMac is connected to power and the power button has been pressed.
2: Make sure that the video cable is plugged directly into the host machine (Not via an adapter or hub)
3: Verify internal display connections.
4: Check to see if there is voltage coming from the DockLites USB ports by plugging in a USB accessory.
5: Check to see if there is audio coming from the internal speakers when connected to a device via the 3.5mm jack.
6: If there the USB ports are not powered and audio isn’t working the DockLite is not receiving power or is defective.
7: Verify that the iMacs Power Supply is functional.
8: Replacement Power Supplies are available from the Juicy Crumb online store.

If your display is blank but is detected by your host computer follow the below troubleshooting steps:
1: Make sure that the video cable is plugged directly into the host machine (Not via an adapter or hub)
2: Verify the internal display and miniDP connections are correctly installed.
3: Try a different host machine and miniDP cable if available.
4: The iMac’s backlight inverter or LCD Backlight is likely defective, verify they are functional by re-installing the iMacs original Logic Board.
5: Replacement backlight inverters can be purchased from the Juicy Crumb online Store.

If your display is flashing but is still recognised by the host computer follow the below troubleshooting steps:
1: Verify internal backlight and LCD connections.
2: Try a different miniDP cable plugged into a different host machine if available.
3: The Backlight Inverter or LCD Backlight is likely defective and requires replacement.
4: Replacement backlight inverters can be purchased from the Juicy Crumb online Store.

If your display is flashing and the host computer detects the display intermittently follow the below troubleshooting steps:
1: Connect the video cable directly to the host machine, bypassing any adapters or hubs.
2: Verify internal LCD and miniDP connections.
3: Try a different miniDP cable plugged into a different host machine if available.
4: If the USB ports are dropping connection alongside the display then the issue is likely caused by a defective power supply.
5: Replacement Power Supplies are available from the Juicy Crumb online store.

If you recieve the error “Firmware Update Failed – Error 513” when attempting to update your firmware using Juicy-Link follow the steps below:
1: Ensure “Full Disk Access” for Juicy-Link and Juicy Crumb Helper is enabled in “Privacy and Security” in your macs System Settings.
2: Restart Juicy-Link
3: Firmware updating should now function as expected.