ericsson business phone 50 pabx phone stuck on sefttesk ok

[kigonya]

Am working on a ericsson business phone 50 (bp50)

It powers on but the lights are red
on the phones it display selftest ok

I tried connecting it to bms through the attached serial port
but the connection failed show no such port exists

 

[xs650]

Try to start the CPU only and unplug all other cards from the system.
If the cpu only is not starting change it with another one.