Hello everyone.

This is my first post here, I've long browsed the site for extremely helpful info many times. Thank you all for the excellent source of retro hardware knowledge.

Unfortunately I was unable to dig up any info on the issue I am currently facing. All searches turned up nothing useful so far.

I recently put together a Socket 7 build consisting of an AOpen AP5T Mainboard, a Pentium 200 MMX CPU, Matrox Millennium GPU along with a Diamond Voodoo 2 and a CT1740 SB16. I am using a Model M keyboard if that is relevant to the issue(AT to PS2 Adapter). The system works great in DOS, however I ran into a very large issue when trying to set up a PS2 mouse.

The issue is when mouse drivers are loaded and as soon as I move the mouse the keyboard stops responding to input. The mouse cursor does not move either. This happens when CTMouse is loaded, or even in the Windows 95 OSR2.5 Setup and a fully loaded W95 install.

Here are the things I have tried during troubleshooting:
Checked pinout between the PS2 bracket and motherboard header.
Reloaded DOS 6.22.
Reloaded Windows 95.
Tried several mice, two PS2 compatible optical mice and one MS PS2 Wheel mouse. (tried two PS2>USB adapters as well)

Has anyone experienced an issue like this before? I am baffled by this issue, as I am not sure where to further troubleshoot before I write this off as an issue with the board.