iMac - boot failure

maryo921 · maryo921 #1 (**permalink**)

05-27-2009, 11:08 AM

I have an intel iMac that will not boot. The light stays on for about 10 seconds and then goes off once the fans will not start. I have replaced the power supply and the logic board twice. I've also swapped parts from a good machine, including fans and cables and get the same result. Totally baffled, any suggestions?

Kevriano · Kevriano #2 (**permalink**)

05-27-2009, 11:51 AM

Have you zapped PRAM and reset NVRAM since changing parts?
Have you tried running Disc Utility from the install disc?
Both worth trying before we go further.

maryo921 · maryo921 #3 (**permalink**)

05-27-2009, 12:53 PM

Unfortunately I can't even get to that point. The machine shuts down within seconds of power-on. It never comes even close to post.

Kevriano · Kevriano #4 (**permalink**)

05-27-2009, 01:37 PM

Ahh ok. Nightmare. It really points to a power supply problem, but if you've changed it, you should be good to go there.
Not sure what else to suggest at present, sorry.
I'm sure one of the repairers here may be able to help a bit.

maryo921 · maryo921 #5 (**permalink**)

05-27-2009, 01:50 PM

It is the strangest thing. I took a good power supply and logic board from another iMac and it still died. I think it's possessed but if anyone has an answer, I'd appreciate it.

Kevriano · Kevriano #6 (**permalink**)

05-27-2009, 02:51 PM

That makes me wonder if there's not a dodgy circuit elsewhere that's frying the power supply.

Collin Bl · Collin Bl #7 (**permalink**)

05-27-2009, 03:52 PM

Check here just in case - Intel-based iMac, Intel-based Mac mini: How to reset the System Management Controller it might help

Kevriano #2 (permalink)
Member Since: Jul 02, 2006 Location: Crawley, England Posts: 4,560 Mac Specs: 20" Intel iMac 2.4 Ghz/3G Ram/320HD, Snow Leopard. PBook G4, 1.5Ghz/1.5 Ram/250 HD, Leopard 10.5.6.	05-27-2009, 11:51 AM Have you zapped PRAM and reset NVRAM since changing parts? Have you tried running Disc Utility from the install disc? Both worth trying before we go further. Try my custom Mac Forums Search Engine: Mac Forums Google Search Please use the reputation system if you consider any help given useful (it's the little ✓/✘ on the left <---)
	QUOTE Thanks

Kevriano #4 (permalink)
Member Since: Jul 02, 2006 Location: Crawley, England Posts: 4,560 Mac Specs: 20" Intel iMac 2.4 Ghz/3G Ram/320HD, Snow Leopard. PBook G4, 1.5Ghz/1.5 Ram/250 HD, Leopard 10.5.6.	05-27-2009, 01:37 PM Ahh ok. Nightmare. It really points to a power supply problem, but if you've changed it, you should be good to go there. Not sure what else to suggest at present, sorry. I'm sure one of the repairers here may be able to help a bit. Try my custom Mac Forums Search Engine: Mac Forums Google Search Please use the reputation system if you consider any help given useful (it's the little ✓/✘ on the left <---)
	QUOTE Thanks

Kevriano #6 (permalink)
Member Since: Jul 02, 2006 Location: Crawley, England Posts: 4,560 Mac Specs: 20" Intel iMac 2.4 Ghz/3G Ram/320HD, Snow Leopard. PBook G4, 1.5Ghz/1.5 Ram/250 HD, Leopard 10.5.6.	05-27-2009, 02:51 PM That makes me wonder if there's not a dodgy circuit elsewhere that's frying the power supply. Try my custom Mac Forums Search Engine: Mac Forums Google Search Please use the reputation system if you consider any help given useful (it's the little ✓/✘ on the left <---)
	QUOTE Thanks

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maryo921 #1 (permalink)
Member Since: May 27, 2009 Posts: 3	05-27-2009, 11:08 AM I have an intel iMac that will not boot. The light stays on for about 10 seconds and then goes off once the fans will not start. I have replaced the power supply and the logic board twice. I've also swapped parts from a good machine, including fans and cables and get the same result. Totally baffled, any suggestions?
	QUOTE Thanks

maryo921 #5 (permalink)
Member Since: May 27, 2009 Posts: 3	05-27-2009, 01:50 PM It is the strangest thing. I took a good power supply and logic board from another iMac and it still died. I think it's possessed but if anyone has an answer, I'd appreciate it.
	QUOTE Thanks

Collin Bl #7 (permalink)
Member Since: Apr 07, 2009 Location: Napier NZ Posts: 3,273 Mac Specs: 27 iMac i5, 2.4 C2D MBP & iMac 20, 1TB dual TC, AppleTV, iPh4	05-27-2009, 03:52 PM Check here just in case - Intel-based iMac, Intel-based Mac mini: How to reset the System Management Controller it might help
	QUOTE Thanks

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