all at once my gmail will not load, any suggestions

I was trying to open my gmail this morning and it kept giving me an error saying to many "redirects made" then it had a question mark to click on the safari and I troubleshooted from there. I emptied my Cache, I checked for software updates, I rebooted computer and internet. It allows me to open another account I have but not two of them that I am trying to view. Could it have to do with my nook and having both opened on that? I have been using them for a long time like that and I don't know how to sign out of my nook to see if that is the problem. I can view my email on my apple account but I am use to viewing it directly on my gmail account. Can anyone help? Thank you