My HD-installed system (version 3.4) has stopped setting up eth0. It was working fine before, then box wasn't used for several months, and when used again, no network connection.

There is no eth0 line in dmesg. However, any of the 'pci' commands will report back detecting the ethernet controller, and I can boot from the CD and eth0 is detected and set up just fine; boot from the hard disk ... not.

From the running HD system, info below from lspci -v

00:09.0 Ethernet controller: Lite-On Communications Inc LNE100TX (rev 20)
Subsystem: Netgear FA310TX
Flags: bus master, medium devsel, latency 64, IRQ 9
I/O ports at ec00 [size=256]
Memory at e7000000 (32-bit, non-prefetchable) [size=256]
Expansion ROM at e6000000 [disabled] [size=256]

'/sbin/ifconfig eth0 up' gives this:

eth0 ERROR when getting interface flags no such device

ls: /dev/eth*: No such file or directory

Where do I need to be looking at to troubleshoot this device problem?

Thanks, john