Imac 27" 2011 power problem and gpu update

[16v]

Hi!

1. I got a 27" imac 2011 today, and it wont power on after pressing power button.
Is there a way to power it up without power button? I can press it, and i can hear it "click"ing while pressing it.
Is there a led to see if power supply is o.k.?

2. I read, this imac has 3 Sata Ports...
2 Sata III and 1 Sata II (which the odd is connected to). I can connect 2 SSDs and the odd?

3. What graphic card to upgrade for use with catalina/monterey/big sur?

Thank you

 

[16v]

I opened it.
No LED.
And shortening power button doesn't bring it on.
Power supply?

 

[Nguyen Duc Hieu]

I opened it.
No LED.
And shortening power button doesn't bring it on.
Power supply?

As described in the Apple Technician Guide for iMac 2011, No LED means no power to the PSU.

 

[16v]

Yes, i found it myself.
A f*** resistor was broken.
I found a guy who repairs apple power supplies.

Imac is runnig well.