Trouble with imail & googlemail

Hello All,
This is my first post on any site so be gentle please.
I'm having trouble with getting mail from a gmail account that prior to the Lion updates I didn't have a problem with. We have one computer with two accounts. My wife and I. On my wifes side it will not load mail from google saying that there is a problem with the server. However if I change to MY mail account,which is where my wifes account originally started and still is, my wifes gmail is still there and connected.
It comes up with an icon that is a triangle with a sign like this ,!, in it.
I did get it up I thought a couple of times but always seems to go back to this problem.
Can anyone help or suggest anything?

Jimsea