Macbook Pros display blinks to blue, icons change size, resolution changes and cant reset. Anyone else have this and have a definitive idea of the cause? End up running diagnostics and resetting PRAM and SMC to resolve but why? Thanks.

We have had several (7-10 recently) macbook Pros start this issue. The screen will jump from regular to blue, the background image will go away and it will be replaced with a blue screen, the icons change size and the screen resolution changes. Someimtes the users name field on the login screen will fly in from off screen... run diagnostics (AppleJack, Disk Util) and reset PRAM and SMC and sometimes this helps but wanted to know if there was a definite reason for this or a better resolution to the problem?
Thanks all
Macbook Pros are all newer (some only a month old) Unibody models running Snow Leopard and Lion

AppleJack has been discontinued, so you should uninstall that.
I'm suspecting something in software across all machine or a security breach as the primary cause of your problems.
Wipe and install everything fresh, firmware update the router, change passwords, new software form original sources, etc.
This might assist.
Step by Step to fix your Mac
WiFi security issues, at home and WiFi hotspots
Harden your Mac against malware attacks
How do I securely delete data from the machine?

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