If you are using the original version of Vista and have not updated to the latest available Service Pack, updating to Service Pack 1 or a later version may resolve this problem. If pressing the Sleep key again does not resolve this, try each of the following methods in the order in which they are presented and determine whether the problem still exists before you try the next method. The Sleep key on your keyboard is configured incorrectly. Your computer may have encountered a system problem. The Keyboard item in Control Panel is not configured to wake the computer when you press a key on the keyboard. If you are having problems waking a laptop by using a Bluetooth device, see Method 3 first. You are using a portable or notebook computer that does not allow resume by using a Bluetooth device. In some low-power states, the wireless transceiver may be unable to receive information from the Bluetooth devices.
Note You may be unable to use Bluetooth devices to resume operation from certain power management states (such as "suspend" or "hibernate"). The Basic Input/output System (BIOS) system that is installed on the computer reduces power to the port to which the input device is connected. You are running Windows Vista and have not updated to Service Pack 1 or a later version.
This issue may occur if one or more of the following conditions are true:
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