If you have problems or delays entering or resuming from Standby mode, it may be because your computer doesn't have a parallel port. The parallel port was the printer port commonly used before USB became popular. Many newer computers, especially laptops and tablet PCs, don't have them. Windows XP has a hard time with this when it comes to power management.
To resolve this issue, use Device Manager to disable the Direct Parallel device. To do this, follow these steps:
1. Click Start, right-click My Computer, and then click Manage.
2. In the console pane, click Device Manager.
3. On the View menu, click Show hidden devices.
4. In the details pane, expand Network adapters.
5. Right-click Direct Parallel, and then click Disable.
From http://support.microsoft.com/kb/308467/en-us
