I changed my MacbookPro keyboard and now my Mac can't recognize my password

I had to change my MacbookPro keyboard and enormous problems came in. I cant not log in to my mac because it can no longer recognize my password. I do not know why but I am sure about my password. So i tried to reset using my Apple account but to no avail because it cannot recognize internet networks as well. I can connect to wifi but it won't go through because there is no internet connection. I tried to plug UTTP Lan internet connection as well but just the same I cant connect to the internet. But I am sure I have internet connection because I can connect my iphone on the internet. Now I am clueless on what I should do. I hope someone could be of help. The new keyboard also doesnt have lights on it. Can this problem be because of the new keyboard installed? Please help. Thank you.