How to View Non-present Devices on Windows XP

[Dr.pter]

When troubleshooting driver problems in Windows XP, one of the first places you may look is Device Manager, which provides detailed information about every piece of installed system hardware. In light of devices such as removable USB drives becoming more and more common, you may need information about devices that are not currently connected; Device Manager recognizes these as non-present devices. Here's how to get information about these devices:

1. Go to Start, right-click My Computer, and select Properties.
2. In the System Properties dialog box, select the Advanced tab and click the Environment Variables button.
3. In the Environment Variables dialog box, locate the System Variables panel and click New.
4. In the New System Variable dialog box, type DEVMGR_SHOW_NONPRESENT_DEVICES in the Variable Name text box and type 1 in the Variable Value text box.
5. Click OK twice.
6. To view the non-present devices, go to Start, right-click My Computer, and select Manage.
7. Click Device Manager, pull down the View menu, and select Show Hidden Devices.

Note: This tip applies to both Windows XP Home and Windows XP Professional.

[fumble]

If you have computer problems, one of the places to look for a solution to your PC problem is the Windows Vista device manager. Especially if your problems are related to hardware or devices, you would look in the device manager for the device status and update or replace the device driver for the device.

There is a chance that you will not see the device in the device manager that you have problems with. This is especially likely with removable hardware. The simple reason for this is that Windows Vista hides the non-present devices in the device manager. So if your removable hardware is not connected, the device manager will not show it.

It is possible to change this behavior of the Windows Vista device manager. With a small Windows tweak, you can show all devices in the Windows Vista device manager. That means that even non-present devices will be shown.

1. Click the Windows Start Menu and select the Control Panel.
2. In the Control Panel, click Performance and Maintenance.
3. Next, click System.
4. In the System Properties dialog box, select the Advanced tab.
5. Next, click the Environment Variables button.
6. In the Environment Variables dialog box, click the New button under the System variables group.
7. In the New System Variable dialog box, type DEVMGR_SHOW_NONPRESENT_DEVICES as the Variable name and type a 1 as the Variable value.
8. Next, click the OK button.
9. Now, select the Hardware tab in the System Properties dialog box, and click the Device Manager button.
10. In the Device Manager, click the View menu and select Show hidden devices.

You can now select all devices and check their properties to fix problems. Since the environment variable is stored and reloaded when you restart your computer, this tweak will remain active until you remove the environment variable.