Please run the diagnostics to check the hardware functionality. Here are the steps:
- Restart the system and immediately start tapping the 'F12' key to enter the 'Boot Menu'.
- Use the 'Down Arrow' key to highlight the 'Diagnostics' option. Press the 'Enter' key.
- The diagnostics will begin. Please note the exact error message/code, if any appears on the screen.
- You may also refer to the video on the link http://dell.to/1hrt2P4 for more information.
You may refer to the link http://dell.to/1bV0cp4 for steps on how to navigate to safe mode in windows vista.
Once you are logged on to safe mode, log on to the administrator account. Please perform the steps given on this link http://dell.to/1eIaCdi.
Hope this helps!
Keep me posted with the results. I’ll be glad to assist.