(I've also done this with the OS, and all device drivers installed with no difference.) According to Microsoft, IP5.2 does support my mouse. Aside from the OS and IP5.2, there is no other software installed on the system. If I upgrade to XP SP2, the problem still exists. If I downgrade to IP5.0, the problem disappears. If I replace my wireless mouse/keyboard combo with a wired mouse/keyboard, such as the IntelliMouse Optical mouse and Natural Keyboard Pro, then the problem disappears. It will turn on after the specified interval, then turn off after that interval has passed again, then turn on again, then off, and repeat. With IP5.2 installed, the Windows screen saver does not work. I am using the Microsoft Wireless combo consisting of the Wireless Optical Mouse and the Wireless Natural Multimedia Keyboard. I've just built up a new system, and installed WinXP Pro w/SP1 on the system, followed by Microsoft IntelliPoint 5.2 software for my mouse. Hopefully somebody can offer me some assistance solving this.

I'm about at wits end trying to figure out this problem, so I'm turning to Ars for assistance.

Microsoft pro intellimouse software