[newbie] Linux Blue Screen of Death

[CHAN Kin Poon]

Greetings,

I wonder if anyone experienced this.

I'm using Mandrake 8.0 and Kmail to download emails from my ISP.
If I have approx 300 or more emails Kmail will crash out after downloading
all the emails.  What is left is the Linux blue screen of death!
I've to press CTRL+ALT+Backspace keys to get back to the KDE login
screen.

I do not have this problem with Mandrake 7.1.  The happens with RedHat 7.2
and SuSE 7.1 too.

Any help here is greatly appreciated.  Tks in adv.