I have just started trialling Photoshop as pasrt of Creative Cloud and I can't get colour (have been into Image>mode but RGB is in grey, not black, so can't select it). Also can't create new layer. I am a little familiar with the program having used it a few years ago but nothing seems to be working. Help?!?!
In Image > Mode, what is the checked mode now?
Could you please post a screenshot to illustrate the issue?
What is the image’s Color Mode?
If nothing else works general trouble-shooting like trashing the prefs might help.
Can you create a new RGB image using File / New… / Color Mode: RGB Color? You need to have a document created or open in the workspace before non-settings-related things, like color mode and layer creation, are active in the menus.