[SOLVED]Sony vaio weird wired network issue

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http://crunchbanglinux.org – A cute new arrival in the house, little Vaio laptop on long-term loan from a friend, has a couple of personality flaws unfortunately. (The slow boot time issue I'll post on separately.)I just can't establish a wired network connection. The eth0 card is detected by the system (Marvell Yukon Gigabit 88E8055), but Network Manager can't establish a dynamic DHCP connection with my modem. The same LAN cable, unplugged from the Vaio and plugged into this IBM desktop, works fine, as with all the (4) other boxes in the house, running Debian Woody, Windows 98, Crunchbang 9 (HowTos)