network card ceased to work

[Yosef Leibovich]

I'm having an hybrid XP to Mandrake coaxial cable card-to-card network. 
The leds on both cards are lit and green however upon dhclient eth0 I 
recieve, socket fall back, then DHCPDISCOVER is being sent to a couple 
of ports, always failing.
I've no idea what's wrong it worked before with the very same setting. 
Have anyone encountered such thing before?
Is there any way to check networking card's hardware integrity except 
the card leds?

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