Ethernet port on MacBook Pro only works under certain conditions

Since I've purchased my MacBook Pro over two years ago now with an initial installment of OSX 10.5.x, I've had a small annoyance if while the OS was up and running and my physical network interface was disconnected and reconnected, a connection could not be reestablished until I shutdown, restart or put my Mac to sleep and woke it back up with the cable connected to the ethernet port. It would randomly work as it should if I connected and disconnected it over and over again until the machine decided I've stimulated it enough to allow me to use it. But it's recently become a real annoyance for me since the tab on my longest ethernet cable broke and it no longer locks it in place and now the slightest budge displaces the cable and I have to put the laptop to sleep often to reestablish a connection.
I would opt to Wi-Fi, but my Mac (surprise, surprise) out of 4 other laptops is the only one whose signal is too weak to use where I use them most. I've reinstalled the OS once to no avail months ago and the problem persisted after downgrading to Slowleopard a day after it's release.
Anyone have any ideas what may be going on? Any help would be appreciated. Thanks.

Hello DavidJoyce
Best thing to do is to buy a new Cat 6 Ethernet cable.

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Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
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Shut down your Mac.
Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on your Mac.
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If you have a MacBook Pro with 10.5, that's usually a machine that's getting long in the tooth and thus running Windows as a virtual machine (one OS inside another) will likely be slow.
Also spending all that money for Windows (VirtualBox is free) and Office seems like almost a waste of effort if the machine is going to die suddenly.
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