Mbox: analog part ok, no input in protools

[VictorQ]

Hello
I am a not so newbie, who recently dusted off the old mbox to do some electronica.
But alas, I discovered that I couldn't record audio!?
The unit is functioning as a playback engine, everything seems fine.
The preamp and monitoring circuit is good: I can monitor the signal from the mic.

The problem persists in all audio applications, suggesting a hardware fault.

My system is a Pentium 4 2.4 GHz. An old thing with a chipset specifically stated as not compatible with PT... But hey! It used to work just fine.

What can I do to fix it!? Please help me! The sound of the Mbox has sentimental value to me!
Victor Jupin