Well, that certainly eliminates a lot of troubleshooting. Bob posted a
good article that may be worth your time with step-by-step
instructions.
I find it improbable that it is something in your Windows power
settings because it is unlikely that any update would have changed
your personal settings. Nonetheless, the behavior is as if the LAN
connection to your DSL modem were asleep -- something that should
never happen.
It looks to me that that article covers most everything. I'd currently
be suspecting the settings on your Network Devices and would
experiment with that.
Go to Control Panel and search for "View Network Connections." Right
click on your "Local Area Connections" and do a "Properties." Select
the "Configure..." button and the "Power Management" tab. Try checking
or unchecking the "Allow the computer to turn off this device to save
power" check box. If it is checked, then I think in your case, I would
prefer it to be unchecked. However, if it is already unchecked, then
go ahead and check it. Restart and experiment with that box checked/
unchecked.
Two other possibilities: 1) your PC may come with some original
equipment manufacture (OEM) software that also controls power
management - that software might either need to be uninstalled or
updated, 2) I cannot eliminate the possibility that your DSL provider
is actually to blame - it can be hell to go through their tech
support, but it could be a last ditch effort. It could also be that
your DSL modem is failing.
There are some power management settings in the BIOS, but none that I
know of that disable the Network Interface Card (NIC).
I can imagine how frustrating this must be. It may be that updated
drivers or a BIOS update are needed as well. Though it appears that
the problem occurred only after installing SP1, it can't be said with
certainty that SP1 caused the problem; but, if it did, updating the
drivers and BIOS might make sense.
If you don't give up first, let me know how it goes. I'm interested in
the outcome.
-solon fox