Wi-Fi works on computer, but not other devices?

When I go onto the CPU, Wi-Fi works normally. But when I try using an iPhone 5 and an iPad 2 (both have ios 7+), it won't connect to our home Wi-Fi network. We can tell that Wi-Fi connection is still possible, because our neighbors' Wi-Fi networks show up. Except ours. Why?

Why can't I follow people or comment on pics on Instagram?

Nobody has blocked me because I can't follow ANYONE. I've waited over an hour then logged back in. I have deleted the app then redownloaded it. I have also turned off my iphone. Then I tried getting on instagram on my computer and still doesn't work. Also, I have only followed 12 people. Any suggestions on what to do?

Where else can I buy music besides iTunes?

ITunes doesn't have what I like (black sabbath, acdc, TOOL, underground rap) I have iphone should I get GALXEE

Added (1). @derrick maybe you listen to pop music or whatever's on the radio then dumb ****

Which iPhone is better? Opinions please?

Ok I'm looking into getting a iPhone 4s. On the Apple website, the iPhone 4s 8GB is free (obviously just the actual phone, not the data plan.) but on craigslist, there's the same iPhone only 64 GB for $100. I need to know what is better. I love music and have a lot of songs on my current iPod. I have 105 songs on my iPod 4 and it is 32 GB. If I get the 8 GB, and put 105 songs on it, plus apps (such as social media: Facebook, Instagram, games e.t.c) will it run slow and the battery get worn out easily? Which is the better option?

Which case is better for an iPhone 5c?

I just purchased an iPhone 5c in pink and was wondering whether I should purchase a lifeproof case for it or an otterbox. Lifeproof retails for $80 while Otterbox retails for $60, and I was wondering if the LifeProof was worth the extra $20. I've read reviews on both sites and LifeProof rates higher than the OtterBox. I was asking on here to see if anyone has had personal experience with one or both, any help is appreciated!

Really urgent! My IPhone 4 won't charge?

I recently got an IPhone 4 about a week ago and everything was working fine on it until a few days ago I plugged it in to charge and it wouldnt charge i switched outlets and blew in the charger and everything I haven't gotten it wet so I don't think thats a problem but anyways the only way it will charge is when i shut it down completely while its connected to the charger and turn it back on. It won't charge any other way. I don't know what to do about it can anyone please help me?

Added (1). Also when i unplug it from the charger the battery life is extremely long there's no other prblems with my phone just that it won't charge