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My 15c is in complex mode and I don't recall how to get it back to regular mode. Can someone help?

Best regards from V.

It did not remove it. Not sure if I understand the instructions. Thanks for your help.

It can't fail ! :-O

With the calculator turned on, you must press exactly
these keys:

     [g]   (the blue key)

[5] (the 5 key, which has CF printed in blue)

[8] (the 8 key)

The complex mode annunciator "C" in the display should
disappear and your HP-15C will be out of complex mode. Else there's some keyboard or hardware problem.

Best regards from V.