iMac 2008 - Won't Start / PSU issues?

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iMac Intel 24" EMC 2134 and 2211

Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Max Flores @maxfloreshn

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Posted: May 22, 2017

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iMac 2008 - Won't Start / PSU issues?

My iMac 24" 2008 won't start!

When my display goes off the computer turns off and so the diagnostic LED. This also happens when I shut down, and after that the 4 diagnostic LED go off as well, so I assume it's a PSU issue.

Altough I can make it start by doing this:

- Pull out the RAM (This will make my fans run)

- Wait around 30 min, or until the computer gets very warm.

- Hold the power button until it beeps

Do you think it's either PSU issue or Motherboard?

Thanks in advance

Answer this question I have this problem too

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4 Comments

@maxfloreshn what do you mean by this "Wait around 30 min, or until the computer gets very warm."? If that happens you can start your computer? Where does it warm up?

May 22, 2017 by oldturkey03

The status of your diagnostics lights is unclear. Are you getting #1 when it is cold. Your diagnostic methods are rather unorthodox and really don't tell us much.

May 23, 2017 by mayer

@oldturkey03 Exactly, I am not quite sure whether the PSU or the motherboard makes the computer work after making the fans run for some time, but that's the only way I can make it start.

May 23, 2017 by Max Flores

@mayer I know it's unclear. After it shuts down by itself (Or sometimes after send it to sleep or restart), all LED go off. In order to get back #1 I have to unplug/plug again.

May 23, 2017 by Max Flores

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1 Answer

@maxfloreshn what do you mean by this "Wait around 30 min, or until the computer gets very warm."? If that happens you can start your computer? Where does it warm up? — oldturkey03
The status of your diagnostics lights is unclear. Are you getting #1 when it is cold. Your diagnostic methods are rather unorthodox and really don't tell us much. — mayer
@oldturkey03 Exactly, I am not quite sure whether the PSU or the motherboard makes the computer work after making the fans run for some time, but that's the only way I can make it start. — Max Flores
@mayer I know it's unclear. After it shuts down by itself (Or sometimes after send it to sleep or restart), all LED go off. In order to get back #1 I have to unplug/plug again. — Max Flores