Start from last "checkpoint done" after I die?

I am playing Halo 4 in Legendary Mode and am at the Forerunner level. I always “Save and Quit” when I get to a new “Checkpoint Done”, but when I die I have to shut down the console and then go through the long process of starting it up again: login, Microsoft Logo screen, 343 Logon screen, and on and on. Takes about 2 minutes I suppose.
After I die, how can I start again at my last saved checkpoint without completely shutting down the console - must be an easier way, please help.

Please don’t cross post topics, thanks
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