changed my apple ID password, now I can't access my email on my laptop. my apple is id is a me.com

So I changed my apple ID password. Now I can't access my email on my laptop. I can get it by going to the iCloud, using the new password. When I try to log into my mobile me, i get the vollow message Unknown validation error and that my member name or password my be invalid and to enter a differnet name or password. How do I