Posted as reference fo others with :
>> The advanced 3D graphics test in PerformanceTest freezes
>> the computer, a re-boot is necessary. Before the
>> lock up I can see - 754.45 FPS 640x480x16
>> Radeon 8500LE HAL (pure HW..). I have Directx 9
>> and AMD 1800, 512M memory. What should I check?
> The #1 support problem is bad video device drviers
> and this should be the 1st thing you check. Either
> upgrading or downgrading can fix issues like this.
I got the latest drivers and that fixed my problem.
I was running ok, I thought, with the old drivers.