group policy – Will Computer configuration in GPO in OU be applied, when client computer startup?

In my theory, the answer is no.
When the computer startup, computer will ask AD for GPO which is under the Domain. After the user logon, computer will ask for GPO which is the OU, where the user at, GPO. Therefore, when computer and user configuration is set in the OU, the client computer will seem only apply to user comfiguration.
Is my theory right?