Thursday, November 29, 2007

Operating Systems: Safe Mode vs Debugging Mode vs VGA Mode vs Last Known Good Config

You are troubleshooting a problem with a Windows XP Professional computer. The system will not start normally. The owner said all she did was download and install a program off the Internet. When she rebooted, the system hung at the Windows logo screen.
You have tried to use the Last Known Good Configuration but the system still fails to boot to the desktop.
How should you attempt to start the system to correct the error?

1. Debugging Mode
2. Safe Mode with Command Prompt
3. >>Safe Mode
4. Enable VGA Mode

Explanation : If using the Last Known Good Configuration does not correct a boot up problem, Safe Mode should be used. Safe Mode boots the operating system with a minimum configuration, and can be used to solve problems with a new hardware or software installation, or problems caused by user settings. Safe Mode boots with the mouse, basic video, keyboard, and mass storage drivers loaded. It uses the default system services (not any extra services) and does not provide network access. It does provide a graphical interface. With the graphical interface enabled, you can use the normal Windows tools and utilities to correct the problem.

Safe Mode with Command Prompt is the same as Safe Mode but does not load the graphical interface. Many standard Windows tools and utilities do not run without the graphical interface.

Enable VGA Mode is used when the video setting is such that you cannot see the screen well enough to fix a bad setting. This can happen if a user creates a desktop with black fonts on a black background, or something similar to that. Booting in this mode gives you very plain VGA video display but allows you to change the settings in the Display properties.

Debugging Mode gives you the opportunity to move system boot logs from the failing computer to another computer for evaluation. To use this mode, you first must connect the failing computer to another computer using a serial cable. You then can review the boot logs on a functioning computer.
Objective: Operating Systems