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G5 power up problem

Message #1 - Posted 2007/04/29 - mhz

G5 2mhz tower
Turning ON the Mac after 30 minutes is OK
but if the computer is OFF for 4 hours or more
then the Mac frooze at startup: no screen, no USB
(the mouse don't light ON). I must reset (holding down the front button 5 secondes) to boot correctly.

However if the G5 is not only turn OFF but the AC cable unplug the Mac boot perfectly.

A similar problem happen when the computer go to sleep for more then 30 minutes: the mac frooze, no screen, no mouse.

Any suggestion will be appreciate.

Message #2 - Posted 2007/04/29 - Warren Oates

Previously, mhz wrote:

G5 2mhz tower
Turning ON the Mac after 30 minutes is OK
but if the computer is OFF for 4 hours or more
then the Mac frooze at startup: no screen, no USB
(the mouse don't light ON). I must reset (holding down the front button 5 secondes) to boot correctly.

However if the G5 is not only turn OFF but the AC cable unplug the Mac boot perfectly.

A similar problem happen when the computer go to sleep for more then 30 minutes: the mac frooze, no screen, no mouse.

Any suggestion will be appreciate.

Dead battery maybe?

W. Oates

Message #3 - Posted 2007/04/29 - Mac Guy

On 2007-04-29 06:32:34 -0500, mhz said:

G5 2mhz tower
Turning ON the Mac after 30 minutes is OK
but if the computer is OFF for 4 hours or more
then the Mac frooze at startup: no screen, no USB
(the mouse don't light ON). I must reset (holding down the front button 5 secondes) to boot correctly.

However if the G5 is not only turn OFF but the AC cable unplug the Mac boot perfectly.

A similar problem happen when the computer go to sleep for more then 30 minutes: the mac frooze, no screen, no mouse.

Any suggestion will be appreciate.

======

http://docs.info.apple.com/article.html?artnum=86760

Message #4 - Posted 2007/04/29 - Jolly Roger

On 2007-04-29 07:07:12 -0500, Warren Oates said:

Previously, mhz wrote:

G5 2mhz tower
Turning ON the Mac after 30 minutes is OK
but if the computer is OFF for 4 hours or more
then the Mac frooze at startup: no screen, no USB
(the mouse don't light ON). I must reset (holding down the front button 5 secondes) to boot correctly.

However if the G5 is not only turn OFF but the AC cable unplug the Mac boot perfectly.

A similar problem happen when the computer go to sleep for more then 30 minutes: the mac frooze, no screen, no mouse.

Any suggestion will be appreciate.

Dead battery maybe?

Yep. I was thinking that or PRAM/PMU needs to be reset.

JR

Message #5 - Posted 2007/04/29 - mhz

Previously, Warren Oates wrote:

Dead battery maybe?

I guess no since date and time work fine...

Message #6 - Posted 2007/04/30 - Jolly Roger

On 2007-04-29 19:23:43 -0500, mhz said:

Previously, Warren Oates wrote:

Dead battery maybe?

I guess no since date and time work fine...

Maybe it's not dead *yet*, but is low enough in voltage to cause malfunctions - quite possible. Anyhow...

Did you reset PRAM?

Did you reset the PMU?

JR

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