Recent news: my WLAN no longer works

that was a short-lived network
(about 1 day). If anyone has advice on where to find what's causing
the error please tell me where to look? I don't see anything in dmesg
except .
wlan0: no IPv6 routers present
Yesterday my system locked up. I rebooted. During reboot, WLAN won't
start anymore. If I go to NETWORK tool it says WLAN is ACTIVE, but I
can't ping from it. The link quality is 0/100. Other WLAN devices on
this net are fine. The LINK LIGHT on the device is OFF.
If I DEACTIVATE it, and attempt to ACTIVATE, the system locks up
everytime requiring a reboot. Same thing happends if I try a
/etc/init.d/network restart, locks up and I have to reboot.
This is complete system lockup not just X crashing. ALT_CTL-F1 won't
even work.
S