Do you use Mathematica 4.1?

[G200 PSYCHOMAN]

Whenever i use the Plot command i don't see any graphs! Even the straight x-y axes is not visible.

I can see dots on the graph using ListPlot command BUT when i use the PlotJoined Command within ListPlot there is Nothing on the graph!

WHY?

This is anoying because i don't think i changed any settings...i even tried reinstalling to get default configuration.

I really need your help!