Problems with modem...

[Masgras George]

Hy...here's my problem...i have a 14400 internal modem on a pentium 166 system with RH 7.0 ...well...the strangest things happen here.... first: if I enter the KDE enviroment and try to connect to the net..it says that my modem isnt' responding.... second: if I run wvdial from bash first( that's before I enter KDE ) and connect, it's ok..until I enter KDE .... everything stops..the ppp0 interface is down....not even the ping or links command doesen't work..so i have to reboot....third: if I run wvdial from bash....and not let it connect to my ISP.... and then run startx....the kppp loader from KDE works....now......i don't have a clue what could it be wrong.... Thanks in advance !