I installed windows 8.1 on my dell Vostro laptop and after installing the same. the screen is not working. Can any one help me out on the same issue?

What exact problem are you facing? Is it a black screen issue?

• At the black screen, press and hold the power button until the  system powers off. 
• With the system still powered off, press and hold the Shift and F8  keys.
• While still holding Shift and F8, press and release the Power  button.  Continue to hold Shift and F8.
•  Release Shift and F8 at this time.
• The Recovery screen should appear.
• From the Recovery screen, click on See advanced repair options.
• Click on Troubleshoot.
• Click on Advanced Options.
• Click on Startup Settings.
• Click on Restart.
• The PC will now reboot to the Startup Settings screen.
• Press 4 to Enable Safe Mode as prompted.
• The PC will now boot to Safe Mode.
• Enter your user name and password as prompted to log into Safe  Mode.
• Open the Start screen.
• Type devmgmt.msc and press Enter to start Device Manager.
• Double-click on Display Adapters to expand the Display Adapters  category.
• Right-click on the specific AMD Radeon HD device and choose  Uninstall from the menu.
• At the Confirm Device Uninstal prompt, check the box Delete  the driver software for this device and then click on OK.
• Restart the PC.
• The PC will now boot to Windows normally.
• Make sure your internet connection is working and then run Windows  Update.  Choose to install all available updates.
• The PC should now be functioning normally