Raz0rEdge
When you said boot in Safe Mode to see if the problem persists, did you mean run my iMac in that mode for a few days? I tried for a few hours but sound didn't work and it seemed a bit strange so I restarted in regular mode. I've run Disk Repair a couple of times but received the message that everything seems OK on the hard disk. I ran Onyx and received the same message. I will now try it in Safe Mode for a few days until KP strikes again! What if it runs happily in that mode for the next week? What would that signify?
Since I first posted on 20 May the Kernel Panic screen has appeared on 23, and 30 May and 1, 3, 5 June and again today. I started to download OS X Mavericks 10.9 but then realised that I run Parallels to provide a Windows partition and that I had had an email from Parallels warning me that my current version was incompatible with Mavericks and recommending that I download their latest version.
As my experience with Parallels is absolutely awful, the last thing I'm going to do is give them any more of my hard earned loot! I've been waiting for my daughter to give me her laptop so that I can run the three programs that will only run on Windows on that and then I'll hold a champagne reception to celebrate the uninstallation of Parallels and the reclamation of my iMac uncontaminated by any Windows partition/programs! Fingers crossed that that happens before the dreaded KP shuts my iMac down permanently without the intervention of the Apple shop