McBook 2011 shuts down when want to enter to recovery mode

Hello everybody, I got a problem with my Mcbook `11 recovery mode , I wanna enter to recovery mode but it gets shut down before I do. there is no problem when OS starts up but for recovery mode I have this problem.
I appreciate your help. Thank U

After toyin around a bit more, I managed to attempt to mount the boot dmg on the RHD. The follow happened:
This confims to me that my boot dmg is corrupted. However I wanted to rule away the option of the firmware password, and hence mounted the dmg with no verification. Using this I was able to sucessfully remove the firmware password. After rebooting I got indeed not prompted for a password when holding alt. The problem with my RHD however persisted.

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