The conversation on this page has been archived and is no longer active.

g5 hard drives won't spin down

Message #1 - Posted 2005/12/05 - julie simpson

We have a truly baffling problem with a 1.8ghz single processor G5, which will gradually spin up its hard drives and never spin them down again. They thrash around even when no applications are launched. In the first minute or so after startup they are quite quiet, but after that they seem to go into overdrive.

Can anyone offer any advice as to what might be causing this? We've stripped everything off and done a clean system install, taken the second drive out altogether, and zapped the PRAM. Nothing seems to make a difference.

Please help - the noise is driving us nuts!

Message #2 - Posted 2005/12/05 - Ray Laughton

julie simpson wrote:

We have a truly baffling problem with a 1.8ghz single processor G5, which will gradually spin up its hard drives and never spin them down again. They thrash around even when no applications are launched. In the first minute or so after startup they are quite quiet, but after that they seem to go into overdrive.

Can anyone offer any advice as to what might be causing this? We've stripped everything off and done a clean system install, taken the second drive out altogether, and zapped the PRAM. Nothing seems to make a difference.

Please help - the noise is driving us nuts!

sure its not the cooling fan?

I have a noisy fan problem with my G4 -totally ruined my Mac experience.

RL

Message #3 - Posted 2005/12/05 - Andy Hewitt

julie simpson wrote:

We have a truly baffling problem with a 1.8ghz single processor G5, which will gradually spin up its hard drives and never spin them down again. They thrash around even when no applications are launched. In the first minute or so after startup they are quite quiet, but after that they seem to go into overdrive.

Can anyone offer any advice as to what might be causing this? We've stripped everything off and done a clean system install, taken the second drive out altogether, and zapped the PRAM. Nothing seems to make a difference.

Please help - the noise is driving us nuts!

You sure it's not the fans running? They normally go full belt when there's a kernel problem in the OS.

Make sure you don't have any Norton or Unsanity stuff installed.

Andy Hewitt ** FAF#1, (Ex-OSOS#5) - FJ1200 ABS
Windows free zone (Mac G5 Dual Processor)
<http://andyhewitt.webhop.net/> (updated Nov. 2005)

Message #4 - Posted 2005/12/05 - DaveC

Thus spake julie simpson:

We have a truly baffling problem with a 1.8ghz single processor G5,

We might be more helpful if you tell us the version of OS you're using.

Are you sure it's the hard drive(s) and not the phan (c: --
Please, no "Go Google this" replies. I wouldn't ask a question here if I hadn't done that already.

DaveC
me@privacy.net
This is an invalid return address
Please reply in the news group

Message #5 - Posted 2005/12/06 - julie simpson

Previously, DaveC wrote:

Thus spake julie simpson:

We have a truly baffling problem with a 1.8ghz single processor G5,

We might be more helpful if you tell us the version of OS you're using.

Are you sure it's the hard drive(s) and not the phan (c:

Sorry. We were using 10.4.0, but reverted to 10.3.8 when we rebuilt it.

I don't *think* it's the fan, but I'll look into that.

Thanks.

Message #6 - Posted 2005/12/12 - David C.

julie simpson <js@forgetthespamauroramedia.net> writes:

Ah, it is indeed the fan - activity monitor shows no hard disc activity. Wow, is this fan noisy!

The fans are software controlled. Under normal conditions, their speed is a function of the temperatures inside the case (except when the fan-control software isn't running - during bootup and after a system panic - when they switch to full speed.)

Different releases of Mac OS have tweaked the fan-speed algorithms, so your software versions will affect this. If you haven't yet upgraded your 10.4.0 to 10.4.3, you may want to try it.

Also, I don't know what your operating environment is, but if the room is warm, the fans may have to spin faster in order to keep the internal temperature within normal ranges.

Also, try playing with some of the Energy Saver parameters. Some have reporteed that setting the processor mode from "automatic" to "highest" quiets the fans down, even though this is counterintuitive.

I've downloaded the firmware upgrade, zapped the PRAM again and installed it, but so far no joy. Is there any fix short of a new fan?

Although a bad fan can definitely make a lot of noise, it is more likely that this is due to either real temperature problems or a bug in the fan-control software.

-- David

Need Help? Have a Question?

Looking for more help, comments, and answers?

Ask your questions on Ask Different. Ask Different is a community of Apple users ready to help.