My Iphone 3s isn't syncing to itunes?

Help! Please!
I have an Iphone 3s and when I plug the USB cable into my computer all it does is charge. Itunes doesn't pop up like it normally does asking to sync. What do I do?!
I've tried turning on and off both my computer (dell) and my phone, both to no avail.
I installed the latest version of itunes, and I can't think of anything else to do! Please help!
Also, I have an itouch and the same thing happens except I can't even get it to say it's charging!
I really don't know what to do!

Added (1). Okay stupid question, how do I do that?

Also, a friend of mine was going through my computer and deleted things he thought were "unnecessary" could that have done it? And if so what do I need to re-install?

Added (2). No, nothing is jailbroken. I use the apple given USB cord and have tried it in All of the USB ports my computer has. ( There are three.) I was able to get my computer to recognize my phone this morning when I put all of my photos onto my computer! I just remembered that.
Also, in Itunes, the phone/itouch is not showing up at all. It doesn't know it's hooked up

Added (3). I just tried a different USB cable and still nothing.

Is this a healthy eating schedule/diet?

I'm a 19-year old college female. I'm 5'1'', and i'm 113 pounds. I've recently gotten into eating healthier, so i was just wondering if my eating habits are healthy.

so i wake up everday between 8 and 8:30 am. I drink some water, and then i have a serving of plain oatmeal with whatever fruit i might have.

I eat lunch around 12-1 pm, and the main thing i eat is salad which has: spinach, tomatoes, cucumbers, baby corn, jalapenos, a little feta, and about 1/4 cup of beans, usually black or chick peas, or if not beans, tofu. No dressing, ever. On the side, i usually eat fruit with 1/2 c of plain greek yogurt, wheat bread with honey and avacado, or something unhealthy like an egg roll or a cookie--depending on what my dining hall has that day.

dinner is usually the same exact thing as lunch, which i have around 5-6.

i usually never eat a snack in between meals since i don't get hungry. If i do get hungry, i snack on fruit.

around 8 or 9 pm, i'll make myself hot chocolate or a french vanilla cappucino (the powder is 25 calories per tbsp with 0g sugar) and eat a small piece of dark chocolate.

I guess i'm wondering if this is healthy because i kept track of my calories for a couple weeks on an iphone app, and my calorie intake averaged around 1100 a day. I know not eating enough puts your body into starvation mode and slows down metabolism, but if i'm not feeling hungry, is it doing that?
should I try to get more calories in? Should i focus that much on calories? Or should i just focus on WHAT i eat?

How to transfer a playlist to my iphone?

I'm trying to transfer a playlist from my Itunes to my Ipod. In Itunes the playlist shows up on my phone, but all the songs are grey and not playable. On my phone they just don't show up at all.

Can someone help me with this, is there additional steps necessary other than drag and drop like in previous Itunes settings?

Why won't my iPhone 5s charge to 100%?

My new iPhone 5s will not charge all the way to 100% even after leaving it on the charger all night. Is there any explanation for why this is?
And is this something I should worry about? Is this evidence that my battery might die early?

(Please excuse the infinite screenshot picture., I was having a bit of fun.
I just took a screenshot to show you the battery life.)

How to restart a game on iphone 4?

I want to restart an app on my iphone. Its called Disney Hidden Worlds. However, after I delete the app and then wait a while to re-download it the game has all the save data. I want to start from the beginning again. Is there a way to remove it from the app store purchases menu? Is there something else I need to do? I never signed in to my game center or facebook so I don't need to worry about that. Also, I never synched this purchase to my computers or iTunes on my computer.