What causes the grey screen with retart statement??

Hello All-
This has happened 4x in the last couple days...While on the internet, I attempt to go to another site, and suddenly with no warning a grey screen slowly scrolls down the displyy with a dialog box telling me I must restart. Does anyone know what this is about? I ran Hardware Diagnostic, no problems...I ran Utility Disk, no problems. Then I ran Norton Doctor, it found a major problem on HD which it fixed. After completing all this, the problem happened again while trying to access pgatour.com!
Thanks-
Dominic

What you are experiencing is called a Kernel Panic.
This is a good article which has some steps you can take to troubleshoot the Kernel Panic.
http://www.thexlab.com/faqs/kernelpanics.html
Then I ran Norton Doctor, it found a major problem on HD which it fixed.
Oh, dear. This is not good. Norton Disk Doctor causes more problems for OS X than it actually fixes. It's basically a cancer to Mac OS X. I would remove it as soon as you possibly can. I would go so far as to say it may even be one of the causes of your Kernel Panics.
There was probably nothing wrong with your hard drive in the first place.
If you search through the forums, you'll see that MANY people have been burned by Norton Utilities, Norton Systemworks, and especially Norton Disk Doctor.
Those products have been discontinued by Symantec as a result of all of the reported issues with Mac OS X compatibilty.

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