Macbook Pro - 10.5.6 screen keeps refreshing?!

Dear fellow mac user,
Tonight (europe) i've been installing the software update 10.5.6 on my macbook pro (late 2006). After installing the software update my mbp keeps refreshing the screen after 15 seconds. When I open up a program it auto shuts down after the screen went blue again.
Is any other macbook pro user having this issue?
I already booted OS x from a backup disk and installed the update again but now my external HD is inffected aswell.
Help? Or it looks like I need to install Leopard etc again =(

Hi,
Turn off the 'Fraudulent sites' option under Safari preferences > Security
That feature has been causing issues for some people and from the crash report, that seems to be the cause here too.

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I will end up getting something other than Logitech speakers, since I'm just weird like that.
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https://en.wikipedia.org/wiki/Audiophile
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Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          6 MB
Memory:          4 GB
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If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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This is just a wild guess on my part, but I have read that when a hard drive is beginning to fail, sometimes the optical drive will also malfunction. You can check out the physical health of your hard drive with the following utility:
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Macbook Pro - 10.5.6 screen keeps refreshing?!

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