My iphone 4s wouldn't switch on?

My iphone 4s was in the cupboard for about 2 weeks unused, and then when i tried switch it on, it's not working. When i plug it into the power adapter, only the backlight comes and stays for some seconds and goes off. It happens again and again, time to time. I checked if the LCI's are activated, but no. I also tried to reset it by holding the Home button and the Sleep/Wake button together, still no luck. What is happened and what can i do

New itunes software problem

So, I have my new Iphone 4 and when I connect it to my itunes, the itunes won't read it because my itunes is old version but in that old version of itunes i can download musics easily ( by simply dragging the song in the device) so i update my itunes with the new one and now the problem is the new itunes is very difficult to transfer music to my new iphone
it says that i ahve to erase and snyc my iphone but my new iphone is not really new its a secondhand but really works great so i don't mind, the problem is there are contents on my iphone that i don't want to erase like videos and games that not free anymore etc.
thats why i don't want to erase and sync it
even syncing will lost the contents of my iphone
i don't know how to download songs/transfer to my iphone w/o syncing.

Iphone 4 says no sim inserted?

I have bought a new sim for an iphone that my dad is giving me. It is the iphone 4 and it was previously on contract, there's nothing wrong with the sim as it works perfectly in my other phone. My dads sim works perfectly in the iphone. My sim works for about 30 seconds then says no sim when you first turn the phone on. Is there a way to fix this?

Added (1). It is a t-mobile iphone and the sim is on t-mobile

Added (2). I have fixed it! Thanks for suggestions but i found that putting tape on the top of the sim card made it work

Back of my iphone is smashed, is it easy to replace the back myself?

So. I'm in idiot and dropped my Iphone on hard flooring in my bathroom. The front is fine, luckily. Otherwise I would of flipped out. I need to know if it is easy to replace the back, i've heard of multi color backings as well. Anyone know if this is easy and if there's a place online I can buy a new back?

Any skateboarders out there. Is this a lame gift?

I want to give my boyfriend a Christmas gift that is something to do with skateboarding, but I have no idea about it! I was thinking of an iPhone case like this…
http://www.zazzle.co.uk/person_skateboarding_photo_iphone_5_covers-179064382562487787? Is this lame? Or should I just go for something like a beanie hat or something…

How long do I keep my iphone in rice? - 1

It's been in there for 17 hours, the apple forums said like 48+ hours but my phone wasn't completely submerged in water. I spilled tea on my chair and my phone fell in the tiny puddle. I tested the speaker and it was very low, then I put it in the rice, it didn't even reach the home button. Any advice?

Is there a bluetooth program for iphone 5?

I had iphone 4 and i was using AIR BLUE SHARING to send and receive files it was perfect, but now i bought iphone 5 and i don't hve cydia so i can't download it, is there another program that i can use for iphone 5?