My Macbook is stuck in "Notebook Battery and Adapter Diagnostic"

I was trying to diagnose my power adapter and got my Macbook(removal battery) stuck in "Notebook Battery and Adapter Diagnostic". I can't figure out how to exit it. There doesn't seem to be a cancel or exit button. I have tried resetting PRAM and doing the take the battery out and hold down power button for seconds. My computer seems to be stuck here and I can't do anything at all.

Thank you for taking the trouble to reply, had already tried all of the above, to no avail in the end had to force quit by holding down start button. Next morning when I started up it asked if I wanted to go into problem application or wait for start up I took 2nd option and all seems ok. Again thank you C

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My Macbook is stuck in "Notebook Battery and Adapter Diagnostic"

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