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Also, try resetting the Mitel Server by powering off and back on; typically takes 5 minutes for the phones to come back on. If this doesn't work you may have a ONS Card that needs to be replaced; contact a service technician who can diagnose the issue.
The phone line between the SX-50 console and the main control is disconnected or the console may need to be rebooted (unplug the phone line then reconnect it). If this doesn't solve it then contact your PBX system support person.
This is explained in the SX-50 system maintainer's handbook, 2 copies of which came with your SX-50 when it was new. However, this is a pretty old piece of phone equipment (30+ yrs) and when these systems were originally set up by outside service companies, it was not unusual for them to take the manuals so that customers would not be tempted to tamper and would call the service co instead. However, all is not lost. There is a very good Mitel support group on Tek-Tips (www.tek-tips.com) On tek-tips the Mitel forum is under Home->Forums->Wiring Closet->Phone Systems->Mitel Networks Solutions Forum. You will need to register in order to post. Hope this helps.
Look for a button on the console that is stuck down. This will cause the problem you are describing. If this is not the case, you need to get with a Mitel vendor to get the console repaired and refurbished.
The console uses 3 pair USOC wiring from the console to the jack on the control card. Look at the Mitel provided cable from the console. It should be 6 pin and you can make sure the console is functional by moving it to the cabinet and plugging it in. If it works, you need to cable 432516 straight through on a 6-wire modular plug and terminate it in the same order on a jack where the console is. They must be paired for the long run.
I have a huge non-indexed pdf of an SX-50 if you need it. The console explanation is figure 5-14 of the -200 practice if you have it.