Why unable to locate devc-con


I installed QNX6.1 on my ComPower laptop it worked well. Last week I made
new partition on my hard disk and installed windows 98 first, then QNX4.25,
then QNX6.1. QNX4.25 worked well too. But I always got “Unable to locate
devc-con” when I use QNX6.1.

I thought maybe there’s something conflict between my QNX4.25 and QNX6.1. So
I uninstalled 4.25 and reinstall 6.1. But still got:

Hit ESC for .altboot…
Press the space br to input boot options…
Detected EIDE. Scanning for devices.
Unable to locate devc-con.

Why? Any ideas?