Mouse and trackpad just not working - can't use machine

Hi there,
I have a late 2009 iMac running an up to date version of Mountain Lion and all has been well until today.
My iMac behaving very oddly with my trackpad. I have tried switching it our for a wired mouse and I get the same results. This is what I am experiencing:
The iMac behaves as though I have either:
clicked and held my finger down - on my desktop when I move the cursor around the iMac thinks I'm trying to select an area
right clicked - when I try and click on an icon in the dock, the right click options appear
Additionally I am experiencing the following
iMac doesn't respond to me clicking on an icon
I can't select an option, ie if I do select an option such as 'Continue' (more of that later*) I can't get the iMac to respond to me clicking it
Before switching over to my mouse I replaced the batteries in my BT keyboard and the trackpad. I've also tried attaching a USB keyboard (albeit a PC one)
I have tried the following:
resetting the V/P RAM
booting in Safe Mode
Shutting down, unplugging everything (inc power cord) and left for 10 mins before rebooting
Booting in recovery mode and reinstalling M Lion - I can't even do this
* When presented with the recovery options I can scroll through the 4 options with the up down arrow keys, I can select 'Continue' with the mouse or trackpad (it goes a solid blue colour) but I move forward - either by clicking it or hitting Enter on the keyboard.
I'm now totally stuck as when I reboot (there's been a fair few forced ones) I can't even select my user profile (or any of the Resart/Shut Down options)
Time to make a Genius Bar apppointment, or is there something else I can do?
Thanks
EDIT: I did manage to select my wife's user profile and eventually got into the system, and very strangley if I access the iMac via LogMeIn on my work PC it responds excatly as it should. I can click, select as normal. Even when I'm doing this remotely my trackpad and mouse continue to behave incorrectly (as described above
Message was edited by: TWH3

Man.. I is such a fool sometimes.
So I reinstalled ML - which on my cruddy 4 MB ADSL connection took a fair while. And still the problem was there.
Then I tried one small thing... take the batteries out of the trackpad and then try using the wired mouse. BINGO.
After a few more tests it has bceome clear that it was the trackpad that was at fault. Not my iMac, not my OS. Having it on would screw up what the wired mouse was trying to do. Should've checked that HOURS ago.
I have a spare trackpad (I used to have a Mac from work and bought myself a trackpad for it. No longer have a Mac for work as a switched employers, but ironcially willbe getting one next week!). I have installed the 2nd trackpad and all works fine.
Lesson learned - do more thorough diagnostics!
I'm off to cancel my Genius Bar apppointment

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