Why isn't this iPhone 5 working?

I have an iPhone 5 that worked fine until it just suddenly stopped working. Its out of warranty so can't be replaced.

I replaced the charging port assembly to se if that was the problem, but still nothing.

I then replaced the U2 IC chip on the motherboard as this was also said to cause this malfunction.

However the phone still doesn't power on at all or even charge? What could be the problem?

What does this mean on a iPhone 5?

I called my boyfriend twice today and it rings for a couple seconds then it goes to voicemail. Did he block me cuz when I use to call him it rang for a couple of times and it went to voicemail or he picked up. I heard that if it goes to voicemail quickly then he blocked you but I don't think I did anything wrong

IPhone iMessage how can I fix it?

Okay so my friend sent me the effective power message and I got mad and sent him one but only said power now my iMessage crashes every time I try to open it and then when I tried to restore it on my computer the computer acted weird how do I fix my iMessage?

Infiniti g35 2005. AUX INPUT?

I would like to use my iphone on it but I don't have an aux input in the car, should I buy an aftermarket radio and if so which would fit the car perfectly? Also if there another way to play music from my iphone to car how can I?

Can I return 16gb iPhone for 64gb iPhone?

Two days ago I got a 16gb iPhone 6 through AT&T's "Next" plan. I feel like I've made a mistake by not getting the 64gb version instead. What should I do? What can I do?

How many different permutations are there if you used 4 different digits?

Clean your screen of fingerprints and punch in your security code. View the screen at a shallow angle and you'll see smudges on the digits.
Now you know which digits were used. The number of permutations are now much less than 10^4.
How many different permutations are there if you used 4 different digits?
How many different permutations are there if you repeat a digit?
Remember, you must enter 4 digits to unlock the iPhone.

Message that turns off iPhone?

How do I send someone that message that you send to an iPhone and it turns it off? There's this hella annoying girl who keeps texting me and I asked to stop and then she send me one letter texts and I tried blocking her but she does it all over social media, so now I just wanna shut her phone off, is there a link or can I copy paste it from somewhere?