iMac 27" power problems
I am having powe issues with my iMac. I get nothing when I hit the power button. I have installed two different power supplies thinking maybe the first one was DOA, but not the case. There are also no LED lights lit on the logic board when I have it plugged in. I thought for sure it was a PS issue but I was wrong. Any help is appreciated. I have had this computer a little over a year and didn't purchase Apple Care.
Also, prior to this all happening I was hearing buzzing noises out of the back of the screen. I have read that this is a known issue.
Is this a good question?
Did you get hit by lightning or have some power line issues just before you noted your system won't work? Do you have it plugged into a surge protector or UPS? Can you tell us more on what happened just when your system died?
No lightening and no power issues. Yes I have it plugged into a surge protector. Before the system was completely unresponsive I was noticing a buzzing sound coming out of the rear of the computer. Buzzing would change volume when I changed the brightness of the display, so I assumed I was starting to have a power supply issue. The buzzing issue happened for maybe 3 or 4 weeks and than one day when I went to restart my computer for an update, it failed to start back up again. No response what so ever when I toggle the power button.
Again, I have installed two different (new) power supplies and still no luck.
Just so we're clear here, review this TN: http://support.apple.com/kb/HT2674. None of these conditions apply correct? Fully dead not a bit of life. If thats so, lets start with the basics: Have you tried replacing the line cord and make sure the surge protector outlet is alive (plug in a light or something into the outlet). Sometimes the simplest problem is over looked.
Correct, none of those conditions apply. Computer is fully dead. I have tried multiple outlets, and yes, I have also plugged in lamps to verify outlets are working. I have also tried different power cords, still nothing.