Disconnect all the external devices (printers, scanner, USB (universal serial bus) drives, etc...) Except mouse and the keyboard and then boot up. If this corrects the issue then
add the devices back one at a time until you discover the piece of hardware causing the issue. Then get any updated drivers\software for the device.
Method 2: I would suggest you to try booting the computer in Safe mode and check.
Follow these steps to boot the computer in safe mode.
Step 1: Safe Mode with DVD
Let’s boot from the Windows 8 DVD and login in Safe Mode.
a) Boot from Windows 8 DVD.
b) After you see a Choose an Option, click on ‘Troubleshoot’.
c) Now click on ‘Advanced Options’ and then on ‘Windows Startup Settings’.
d) Use your arrow keys to go to ‘Safe Mode’ and hit Enter.
If you are able to boot into safe mode, try performing a clean boot.
Step 2: Perform Clean Boot.
To help troubleshoot error messages and other issues, you can start Windows 8 by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean
boot." A clean boot helps eliminate software conflicts.
Important: Reset the computer to start to normal startup.
Note: After you have finished troubleshooting, follow these steps to boot to normal startup.
a) Press the ‘Windows + R’ key on the keyboard.
b) In the ‘Run’ window type ’MSCONFIG’ and click ‘Ok’.
c) On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’. d) When you are prompted to restart the computer, click ‘Restart’.
I would suggest you to perform a startup repair using
Windows 8 bootable DVD or USB drive and check if that helps.
a) Insert the installation DVD or USB and boot Windows 8 from it.
b) In the ‘Windows setup’ page select the ‘language to install’, ‘Time and currency format’ and the ‘keyboard or input method’ and click on ‘next’.
c) Click on ‘Repair your computer’ and select ‘Troubleshoot’.
d) Click on ‘Advanced options’ and select ‘Automatic Repair’ and select the operating system.
If the issue still persists you can contact the Dell technical support .