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

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iMac freezing on startup/booting from usb/cd

Hi!

I have an 24' iMac from 2008.

It started by freezing at startup screen, So I replaced the HDD thinking that was the fault, but the original HDD had no faults with it.

Now when I try to boot it from a USB/CD it freezes at the loading circle ( Can't enter the Resotre program)

Tried an SMC Reset and also a NVRAM reset.

Also tried with different RAM Sticks

But it still freezes.

Any ideas?

Update (05/14/2017)

Apple Hardware Test does not show any problems either.

Answered! View the answer I have this problem too

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What do you mean freezes?

Have you been able to get to the desktop at all?

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No, when I try to go into the Installation from the USB, the little spinnig wheel spins for maybe 5 sec then it freezes and restarts after like 5 minutes after freezing.

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Please tell us what the diagnostic LEDs are telling you:

iMac Intel 24" EMC 2134 and 2211 Diagnostic LED's

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All 4 are lighting up when I start it,

I did also try to install Windows on it, which worked without any problems.

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See if it will boot from the original system installation DVD. Hold down the C key on start up and insertion.

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Unfortunely I no longer have the original dvds, although I did have a LION installation disk, same problem there.

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viffviff will be eternally grateful.
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