Hello shakeelahmedmo, and welcome to Android Forums; thank you for joining us.

First let's get your question about your device into the sub-forum here where others users of that particular phone can lend assistance.

A few things you can try right away:

- carefully remove the battery and SIM card, wait a minute and then put them back in

- try to boot up the device

- if the same problem is there, you may need to reset the device back to factory condition

- if you find that a hard reset (factory data reset) is necessary, here is one method of doing that:

Sony Ericsson Xperia Arc S (LT18i) dead - YouTube

Tell us how things are going.. other members here with that device will chime in with more help if necessary.