1 Is my logic board, or my power supply, or my RAM gone?
Hey guys,
My imac won't start up.
When I press the power button I can hear the hard drive and the fans working but no chime.
I've checked the RAM, by replacing.
When I took off the LCD to determine if the failure is related to a faulty LCD, I powered up the machine without the LCD connected. This resulted in blowing the fuse.
The diagnostic LEDs 1-3 are lit.
Has anybody a clue on that?
Mit freundlichen Grüßen
Andre.
Update (12/03/2015)
I replaced the ram by a certified one. That should be fine.
But still the same behavior.
12 
1 
Remove the RAM and press the power button. Do you get beep error code?
由 Shmajay 完成的
It sounds like it's getting power if you can hear the hard drive and fans power up.
由 Jesse 完成的
If you could try starting it without the RAM we can see what part of the POST it is failing. If you don't get a RAM error code we know it isn't even getting to that point. Which means the issue you're having is before the RAM check, which would lead me to believe that it is a processor or Power Supply issue since those are both checked before the RAM. If it's after then it could be an overdraw from the HDD or ODD
由 Shmajay 完成的
Can you discern the desktop with a flashlight?
由 mayer 完成的
since you heard the fan, it means its getting power, therefore the problem lies with either the display of the hard drive, check on those things and let me know how it goes so i can know how to help you
由 kekemeke godspower 完成的
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