Monitor cycles on and off many times before settling and staying on
When I turn my mac mini on or revive it from sleep, the monitor wakes up for a short time, then goes black for 30 seconds then revives itself for about 23 seconds in a cycle (on, off, on, off) that lasts about 30 minutes, maybe longer. After which, the monitor stays on indefinitely.
...until the computer goes back to sleep or is turned off... then the whole cycle starts over.
I do not have to touch anything for the cycles to happen.
The computer is running fine, in fact I can continue to type... I just cant see what I am doing.
This problem is a recent development and was not triggered by anything I am aware of.
After 6-8 times of going through this, I have not yet noticed any change in duration of cycles or of the length of time before it settles out.
I have a Mac Mini (Mid 2011)
External DELL monitor connected via Thunderbolt port mini display port to VGA.
I have tried reseting the SMC and PRAM with no correction to the problem.
Hello slodave,
Since you are not hearing the hard drives or anything kick on for a while it sounds like the issue may be with your power supply.
You may want to look at the power supply there should be a light on it. See if it shows it is starting properly before the computer actually turns on (so this is during the 6+ times it is turning on and off).
If the power supply is going then you may just need to replace it to continue normal operation.
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