Can't open Pixma MG2550S

[JanI]

I need to replace black cartridge but can't get the output cover to open.  Have never had a problem before.

Solid orange light has been lit for a while, since the ink level got low.

I've unplugged for a while, but that doesn't make any difference.

Any suggestions?

[JanI]

PANIC OVER. 

CLEARLY IT DIDN'T LIKE THE WAY I WAS LOOKING AT IT.  WENT TO MAKE A CUPPA AND WHEN I CAME BACK IT OPENED AT THE FIRST ATTEMPT.