Having strange screen reaction when not logged in

OK, most people call it the logon screen (no user account active, system running). So you have a screen thats also distorted like the OP does? The fact you are on the Logon screen Vs a given user account doesn't really matter as the system doesn't know the difference. It just paints the display with what the CPU tells it.

1 feb. 2015 door Dan

Nop, I mean locked because my Mac is running a logged account.. :)

So not that real what you said there I think, because I have exactly the same background, and it only flickers when I "lock it".

I tried a few PRAM and NVRAM resets and it was better but it keeps doing it time to time.

2 feb. 2015 door Miguel Saraiva

OK, I think you have a hardware password set then (no need to login to a user account). When you mean flicker its the intensity Vs distortion correct?

2 feb. 2015 door Dan

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Locked as in when is asking for password...

Ex: Ctrl+Shift+Eject and it's locked, what would you call it? — Miguel Saraiva
OK, most people call it the logon screen (no user account active, system running). So you have a screen thats also distorted like the OP does? The fact you are on the Logon screen Vs a given user account doesn't really matter as the system doesn't know the difference. It just paints the display with what the CPU tells it. — Dan
Nop, I mean locked because my Mac is running a logged account.. :)

So not that real what you said there I think, because I have exactly the same background, and it only flickers when I "lock it".

I tried a few PRAM and NVRAM resets and it was better but it keeps doing it time to time. — Miguel Saraiva
OK, I think you have a hardware password set then (no need to login to a user account). When you mean flicker its the intensity Vs distortion correct? — Dan

MacBook Unibody A1278

Having strange screen reaction when not logged in

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