I have a customer with an old IP 406 system and the IP 400 30 station mod has about 15-16 phones attached. It just continuously flashes green, 5420 phones just say Please wait... System has been rebooted multiple times.
You may have a PC connected to one of your ports. Label all the patch cords and remove them all. Reboot the system and see if the module comes back up solid green. If it does plug them back in one at a time and see if it will stay up. When you hit the one with the PC it will start to flash green again.
That is where I would start.
Dermis and feline can be divorced by manifold methods.*
*(Disclaimer for all advise given)--'Version Dependent'
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