Screen flickering on and off

I have an Early 2009 iMac 24 Aluminum (2.93GHz) and had it in a box for a few months, then started using it again after moving into a new house. When I powered it on, after booting up, the screen starting going black then back on, then black, then back on. Quick flashed of the screen turning off.

I randomly decided to lower the brightness down to 40% and it has not been flickering anymore. Any thoughts what the flickering is from? Surge protector? After market RAM that was installed recently? Graphics card?

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Sounds like a graphics or controller issue. Connect to an external monitor. If the behavior is there it's part of the VGU/VGC, if it's gone it's a component in your internal display chain.

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Same happened for me. Lowering the brightness worked

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