Powers on then shuts off

Examine the capacitors (cans) for corrosion, swelling and or leakage. What are the LEDs in the center showing on boot up? Use the reset and restart gray buttons on the logic board to the left of the LEDs to attempt restart.

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10 commentaires:

This is early 2006 model (no diagnostic leds) :( And capacitors is ok. Before CPU upgrade iMac worked well.

I've tried many cpus but no success. Only power light goes on and hdd starts (no startup chime) 5 seconds after iMac goes off.

26 juin 2015 par MacProblemer

Please give the last four figures of your serial number, (located on the bottom of the stand).

26 juin 2015 par mayer

GU2P

EMC No.: 2105

iMac 20"/2.0GHZ/512MB/250GB/SD/AP/BT

26 juin 2015 par MacProblemer

Apple iMac "Core Duo" 2.0 20-Inch Specs

Identifiers: Early 2006 - MA200LL - iMac4,1 - A1174 - 2105

26 juin 2015 par mayer

Here's the guide for the CPU upgrade but that does not appear to be your issue. Try disconnecting the hard drive cable and see if it will boot from the original system installation CD. http://www.maclife.com/article/create_up...

26 juin 2015 par mayer

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This is early 2006 model (no diagnostic leds) :( And capacitors is ok. Before CPU upgrade iMac worked well.

I've tried many cpus but no success. Only power light goes on and hdd starts (no startup chime) 5 seconds after iMac goes off. — MacProblemer
Please give the last four figures of your serial number, (located on the bottom of the stand). — mayer
Apple iMac "Core Duo" 2.0 20-Inch Specs

Identifiers: Early 2006 - MA200LL - iMac4,1 - A1174 - 2105 — mayer
Here's the guide for the CPU upgrade but that does not appear to be your issue. Try disconnecting the hard drive cable and see if it will boot from the original system installation CD. http://www.maclife.com/article/create_up... — mayer