Imac intel core duo (2008) crashed and wont reboot after Mountain Lion upgrade

Hi can anyone help?
Hi, my imac was loaded with Snow Leopard and I upgraded to Mountain Lion a few days ago and today when I got back from leaving it a few hours the screen went funny!!! (see pic) and it wont reboot. The same screen appears straight away when restarting. I have tried holding down the shift for safe start but it didnt work and also a nv/ram pram reset (but only heard one 'mac sound')
I have my old snow leopard disk..............somewhere!!! but I'm not sure if I can boot from them if I have just upgraded to Mountain Lion via the app store download??
I didnt do a boot disk! (yes I know) or a back up (yep again...I know!) so if anyone has any ideas on how to help :-) I'd be very grateful!!
Thanks Melanie
PS is the problem called a Kernel Panic????

I'm afraid my next piece of advice you won't like. I think you need to erase the drive and reinstall Mountain Lion from scratch.
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
  1. Select Disk Utility from the main menu and click on the Continue button.
  2. After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on
      the Erase tab in the DU main window.
  3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security button and set the Zero
        Data option to one-pass. Click on the Erase button and wait until the process has completed.
  4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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