no signs of life, new psu, still dead! Help

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iMac Intel 20" EMC 2133 and 2210

Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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nathan @nathan48765

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Posted: Nov 23, 2013

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no signs of life, new psu, still dead! Help

My dad told me the house got struck by lightning and his iMac died..so he gave it to me and told me it was probably the power supply..I ordered a new one..popped it in and nothing happens..No fans, lights, beeps..whatever, the new psu tests 4vdc on pin 5 and 12vdc on pin 9..the old one tests 2.4 vdc on pin 5 and 12vdc on pin 9..from a guide i read, i should be getting 12vcd on pin 8 rather than 9.. Has anybody experienced anything like this or have any recommendations for me? Thanks.

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Can you give us the last three digits of your serial number so we can identify which model you have

Nov 23, 2013 by Dan

last 3 of serial, ZE3

Nov 23, 2013 by nathan

OK your system is: iMac "Core 2 Duo" 2.66 20-Inch (Early 2008) 2.66 GHz Core 2 Duo (E8335)

Nov 23, 2013 by Dan

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Dan @danj

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Posted: Nov 23, 2013

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Here's the correct guide to follow to test the power supply iMac Intel 20" EMC 2210 Power Supply Output Voltage Test

Also your system has a set of diagnostic LED's just inside the RAM access door:

LED 1 indicates that trickle voltage from the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly.
LED 2 indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.
LED 3 indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.
LED 4 lights only if the computer detects an over-temperature condition. This LED will be OFF when the computer is turned on and running at the correct temperature.

What are they telling you?

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That is the guide i used to test my voltage. All of the LED's are off

Nov 23, 2013 by nathan

Sounds like yo have a bad unit or the power logic on the main board is damaged from the hit. Did you have the system on a surge suppressor? And did it burn up from the strike? Have you made a careful inspection of the logic board (both sides) to see if anything got burnt?

Nov 23, 2013 by Dan

The system was on a surge suppressor and both sides of the logic board look OK. I don't want to throw parts at it so I'm kinda at a loss with this one. Nothing smells burnt or anything.

Nov 24, 2013 by nathan

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Can you give us the last three digits of your serial number so we can identify which model you have — Dan
OK your system is: iMac "Core 2 Duo" 2.66 20-Inch (Early 2008) 2.66 GHz Core 2 Duo (E8335) — Dan
That is the guide i used to test my voltage. All of the LED's are off — nathan
Sounds like yo have a bad unit or the power logic on the main board is damaged from the hit. Did you have the system on a surge suppressor? And did it burn up from the strike? Have you made a careful inspection of the logic board (both sides) to see if anything got burnt? — Dan
The system was on a surge suppressor and both sides of the logic board look OK. I don't want to throw parts at it so I'm kinda at a loss with this one. Nothing smells burnt or anything. — nathan