Not powering on whatsoever!
I tried SMC reset, opened up the 2011 21.5” iMac, reconnected the power cables.
I only see LED #1 turned on that indicates power. I reseated the CPU as well and even replaced the CMOS battery.
Doesn’t turn on - No fans spinning, no chimes / sounds and no display. What could the issue be? How do I find out what’s gone wrong?
A few questions:
- Could a bad GPU prevent it from turning on?
- Could a bad CPU be the issue?
- Will it turn on without HDD?
- How do I test the power supply unit and will the diagnostic led turn on in case of bad power supply?
- Could it be the Logic Board?
PLEASE REPLY AS SOON AS POSSIBLE
Thanks,
BTW
Update (02/11/2021)
@danj When I disassembled the mac's gpu, I found that the thermal paste leaked onto the chip. The heat sink is black on top. Is this normal?
Images:
https://drive.google.com/file/d/1GL0dzU_...
???????
Esta é uma boa pergunta?
Can you give us some back history. What happened, was it working and then stopped on its own? What kind of apps are you running.
por Dan
@danj I am not sure about that, i forgot. Was it necessary?
por BTW TECH
@btwtg - Like a doctor we often need to understand what happened. Often it can give us a lead on what needs to be looked at.
I love this movie! Awakenings If you haven't seen it watch it.
Now getting back to your issue ... What does this movie tell you about the condition Encephalitis Lethargica that many doctors couldn't break through as they just had too little to work with. What did Oliver Sacks see that the others missed?
So... We need to have a better understanding of the cause to be able to know which way to go.
por Dan
@danj
it was most probably turned on, running, no malware, default OS and it just turned off and didn't start after that . The fans don't spin / hdd doesn't turn on when I press Power button. I almost forgot about it until I recently found it lying in the loft. This happened more than an year ago. I know that its been long and I should have brought the issue out at that time but i wasn't interested in mac's.
So, how do I know where the problem is? I removed the HDD and replaced PRAM Battery.
No matter what, only LED #1 is lit.
por BTW TECH
@danj also, how do I test the Power Supply using multimeter?
por BTW TECH
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