my macbook pro won't turn on without any reason?

See here: http://support.apple.com/kb/TS1365

Step by Step to fix your Mac

Mac won't boot or "You need to restart"

Create a data recovery, undelete boot drive

I think you need to plug in your Mac. No battery indicator lights indicate the battery is dead. Get your MagSafe and plug it in. Problem solved!🙂

Is there an amber light on the MagSafe when connected to your machine?

If the battery has been dead for a while you may have to wait 20-30 minutes with the charger attached before your Mac will start, if the battery has been flat for too long you may need a new battery.

Press the power button for 10 seconds, release, try to turn your Mac on again.

Perform a SMC Reset

Step by Step to fix your Mac

You need to hit the "reply" button on post to whom your responding too, it's hard to tell if your responding to me or someone else. 🙂

small button on the side of the computer and didn't lightting up( no reponse at all). is their any problems do think with the battery?

Usually if your battery is dead because it wasn't charged you can do the SMC Reset and then check the Magsafe if it's connected and showing the orange light, then let the battery charge up.

Once the battery charges up, the computer will boot normally and then you have to reset the PRAM, time, date etc.

https://support.apple.com/kb/TS1365

Magsafe issues: https://support.apple.com/kb/TS1713 https://support.apple.com/kb/TS4127

*PRAM Reset http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html

What's store in PRAM https://support.apple.com/kb/HT1242

Hardware Test

https://support.apple.com/kb/ht1509