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?
Is this a good question?