My Pro has had RAM upgrade. Will not login.

My Pro has had RAM upgrade. Brand new compatible module. Boots fine but will not login.
The password is typed in correctly (per account).
A light grey screen & mouse cursor appears then we are cycled back to the login page. If we deliberately try an incorrect password we get the 'shimmy & shake' of an incorrect password.
The H/W test passed.
What do you suggest?
Many thanks!
Andy.

I don't own a MBP but that sounds bizarre. Did it shut down as soon as she plugged it in?

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