Screen switches to blue and then fades back to normal repeatedly

My Mac Pro's screens have started switching to blue and then fading back to show the normal screen contents. Each cycle takes a couple seconds and looks like my Mac thinks it's waking up from sleep. It starts off happening a few times a minute and gets faster until it's happening once every 5 seconds or so. The mouse goes unresponsive just before it switches to blue and then comes back to life when the blue fades out. Interestingly this has been occurring every morning since I started using Snow Leopard; once I shutdown and start back up again it's fine (until the next morning). No messages in the console to indicate what's going on.
Has anybody seen this or do you by chance know what's happening? I power off the monitors at night but leave the system on (not sleeping), so it's interesting that it seems to happen every morning, about 15-30 minutes after I start using it.
Thanks,
Adam

Nah, I'm on latest Snow Leopard version. I think the issue is actually RAM as I installed 8gb worth on top of the 4gb I already have in the Mac Pro at teh weekend. Rise B was not seated right at first so I had to open it up and re-seat it - it then showed all 12gb
I've just had a look and it's showing Riser B as empty for some reason again!! I know it's not the memory itself but for some reason this whole board does not want to go back in properly - grr!!
Will try again in a mo and see if it makes a difference
As it happens while i get the same result as you do with the blue blinking I have a few minutes in between each fade to blue and back again! AND it closes all applications at same time too!

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Keywords: khelp kmosx7

Screen switches to blue and then fades back to normal repeatedly

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