Power Mac - Start up problems

Bowdery · Bowdery #1 (**permalink**)

04-02-2009, 05:43 AM

Hi All

I have been having problems with my G4 Mac starting up. When you press the on button on the front the light comes on then fades to off. I thought it might be the battery so I changed it but still had the same problem. I found a small button the the mother board next to the battery I pressed it (with noting to loose) and a red light come on (on the motherboard) and the machine started up. So far it seems to be running OK since last night. Any ideas what the button does? I'm running OS 10.4

Many thanks

johnwd5 · johnwd5 #2 (**permalink**)

04-02-2009, 08:31 AM

That's the CUDA button. Are you sure you changed for a new battery ? Turn out g4, unplug, press CUDA for 10 seconds then reboot.

Bowdery · Bowdery #3 (**permalink**)

04-02-2009, 09:13 AM

Thanks for the info. Yes it is a new battery I bought it in Maplins yesterday. What does the CUDA button do?

Thanks

harryb2448 · harryb2448 #4 (**permalink**)

04-02-2009, 04:59 PM

Have a sticky at this:-

Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3

The CUDA is actually the PMU switch. You changed the PRAM battery and resetting has taken the machine back to default so all should now be well. Check the date, time and region settings to make sure they are okay.

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Power Mac - Start up problems

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Bowdery #1 (permalink)
Member Since: Apr 02, 2009 Posts: 4	04-02-2009, 05:43 AM Hi All I have been having problems with my G4 Mac starting up. When you press the on button on the front the light comes on then fades to off. I thought it might be the battery so I changed it but still had the same problem. I found a small button the the mother board next to the battery I pressed it (with noting to loose) and a red light come on (on the motherboard) and the machine started up. So far it seems to be running OK since last night. Any ideas what the button does? I'm running OS 10.4 Many thanks
	QUOTE Thanks

johnwd5 #2 (permalink)
Member Since: Jun 19, 2008 Posts: 198	04-02-2009, 08:31 AM That's the CUDA button. Are you sure you changed for a new battery ? Turn out g4, unplug, press CUDA for 10 seconds then reboot.
	QUOTE Thanks

harryb2448 #4 (permalink)
Member Since: Nov 28, 2007 Location: Nambucca Heads Australia Posts: 14,095 Mac Specs: iMac i5 2.7GHz OS X.8.3	04-02-2009, 04:59 PM Have a sticky at this:- Resetting Cuda/PMU on Power Mac G5, Power Mac G4, Power Macintosh G3 The CUDA is actually the PMU switch. You changed the PRAM battery and resetting has taken the machine back to default so all should now be well. Check the date, time and region settings to make sure they are okay.
	QUOTE Thanks

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