Iphone 4 won't connect to Wi-Fi? - 3

My iphone won't connect to my home Wi-Fi. It recognizes that we have Wi-Fi but it says unable to join the network. I restored my network settings, restarted (not restored) my phone at least 7 times, and I've let it sit w/o Wi-Fi being on for a few hours. I don't know what to do. I had to replace my screen and maybe I messed with the connection during the process, if I did what do I need to go back and check? Just in case your wondering. I'm doing this on my sisters phone.

I suggest you take it into best buy or a local store where they sell/fix technology.

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