Event ID 13 and event ID 516 may be logged every 40 minutes after a computer that is running Windows Server 2008 or Windows Vista Service Pack 1 resumes from sleep

When the TPM chip resumes from sleep, it must receive a command to continue a self-test before it is ready to process other commands. If the TPM chip does not receive the self-test command before the computer sends other commands to the TPM chip, the TPM chip generates an error message that states that the TPM chip needs a self-test. On many computers, the system Basic Input/Output Settings (BIOS) will issue a command to the TPM chip to continue the self-test. Computers that have the symptoms that are mentioned in this article have a system BIOS that does not issue a command to continue the self-test on the TPM chip.



Every 40 minutes, Windows Server 2008 and Windows Vista SP1 try to use the TPM chip to generate a random number. When the TPM chip returns an error for reasons other than the TPM chip being deactivated or disabled, the TPM driver and TBS log these errors in the System log.

When this issue occurs, the operating system cannot use the TPM chip to generate random numbers for entropy. This behavior causes the operating system to use the same mechanisms to generate random numbers for cryptographic methods that are used in versions of Windows Vista that are earlier than Windows Vista SP1 and on systems that do not have a TPM chip.