Q: Blue screen

Hello Jalini05,

Thanks for using Apple Support Communities.

In order to resolve this issue, I'd like you to first try the troubleshooting in the articles below.  First, reset your PRAM and SMC.  If the issue persists, then I'd like you to try and boot into Safe Mode.  After all of that and your screen is still appearing solid blue, then please seek service for your Mac.

Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support

How to Reset NVRAM on your Mac - Apple Support

OS X: What is Safe Boot, Safe Mode? - Apple Support

If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).

Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).

Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support

Take care,

Alex H.