I have a mid 2007 iMac w/ mac OS X Lion 10.7.5. My time machine (LaCie) is not responding through firewire port (since day one).  Did an update mess this up?

I have just recently realized that my time machine has not backed up in a couple of weeks. I am using a LaCie external hard drive that I purchased with the iMac and has been plugged into the firewire port since day one.  When I try to establish a connection it only gives me airport utility.  When I look through network connections it shows that my fire wire is not connected or at least it doesn't find anything connected. 
I have also been getting a start up disk message off and on that I need to close applications due to no more memory? (or something similar to that). 
Just curious what might have changed.  Did an update re configure something? Are these two issues connected? 
I have always loved my Mac for the fact that it just always worked.  I'm not super savvy with computers and the settings so I'm not the kind that just goes in to tweek things. This is the first real issue that I have had with it.  I would think that it was the fact that I upgraded to lion but I did that quite a while ago.

Hello,
It isn't the fw in Network you want o use or look at, that's for something completely different.
My first suspect is the Power Adapter on the LaCie has gone.
At the Apple Icon at top left>About this Mac, then click on More Info, then click on Hardware>Firewire, what is listed there?
Reset the Firewire bus
If your Firewire or USB isn't recognizing any device.  A solution which has worked for some whose hard drive became invisible in 10.4 was simply to follow these four steps to reset the Firewire/USB bus:
1. Shut the machine down.
2. UNPLUG the power lead to the computer and any firewire/USB drive or devices.
3. leave it for 10 minutes.
4. Connect back up and reboot.
http://www.macmaps.com/firewirebug2.html

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