What determines when a battery is bad?

I also am having a similiar situation where the battery shuts down early, or drops from 50% to 0% in minutes. I believe the problem is with the battery. Other symptoms include extremely slow opening of programs or the forever spinning "multicolored wheel". I performed a PMU reset and it didn't help. Previous posts always has you checking them but don't explain what they mean or how low they can go before you should replace the battery. My ibook G4 is almost 2 years old and the system profiler gives me these numbers. Also - I see problems can arise from not getting a good replacement battery. Does anyone have any recommendations on where to purchase a good one?
Full charge Cap mAh 751
Remaining Cap mAh 751
cycle count 343
voltage (mV) 16664

There may be more than one thing behind this issue;
but the battery numbers you've posted would indicate
the battery is not up to par in capacity or remaining
life. The power number should be in thousands mAH;
and the cycle count is getting high.
Does your Battery specs from System Profiler area
say anything about battery status other than those?
I have a free widget in Dashboard called iStat Pro
and that says a few more things about battery and
other system specs.
The System Preference's Energy panel should have
some information and settings to help ration power;
but your posted battery numbers indicate a problem.
Does the power adapter show as charging the cell?
This would appear in the system panel, not just in
the lights on the battery or in the gauge. And, have
you performed the maintenance including calibration?
A machine seeing a good amount of battery use
could reasonably need a replacement battery after
two years; but the cycle count could be higher be-
fore an actual failure; I've seen over 450 cycles.
Places such as OWC and NewerTech batteries
may be worth a look; some of the better options
offer an external battery charger with conditioner
cycle for their cells, and a longer life cycle. I like
the Apple original replacement, it does OK.
Another issue in the computer may be due to lack
of free space in the hard disk drive; that would be
something to do with the spinning wheel and slow
activity when running applications & in the System.
The hard disk drive needs unused free space for
Virtual Memory; this supplements chip RAM in
most everything in Mac OS X, the system & apps.
And if the hard disk drive is getting worn out, that
too would show in performance and failure issues.
One of the posts about percentages of battery loss
in short duration intervals, where I replied, has links
to the various procedures and prescribed methods
of battery maintenance. There are other sections in
Support where system maintenance & repair appear.
If these areas are also acting poorly, you may need
to see if all the basics are covered, including the oft
repeated concept of 'repair disk permissions' et al.
Good luck & happy computing!

Similar Messages

Lost my iPod, remotely locked it through iCloud. What happens when the battery goes out?

Hello!
I lost my Ipod, but managed to locate and lock it remotely through Find my iPod and iCloud. It was located once, but hasn't been located again in the last four days. I think the battery may have run out. What happens when the battery is charged and the iPod turned back on? Does the lock and everything else that can be controlled with Find my iPod still apply?
Thank you!

Yes, because when you remotely lock the iPod via Find my iPod, the lock code is set as the lock code that you would use to unlock the iPod if you used a passcode normally. As long as the iPod is still connected to your Apple ID, Find my iPod should work as log as the iPod is connected to wifi.

What determines when the My Timesheet item will display in the Resource Availability Page?

Can someone point me to where I can get more information on the My Timesheet item that displays in the Details section of the Resource Availability page? I cannot figure out where this information is coming from or what determines how many My Timesheet
lines you see.
In one Project Server environment, I noticed that each user had 3-4 My Timesheet line items in the Resource Availability page. The period I was looking at spanned 8 weeks and all of those weeks were in the future. I checked the Manage Timesheets
page for one of the users that had 4 My Timesheet items in the Resource Availability page. The user did not have any timesheets created for the 8-week period I was reporting on in the Resource Availability page. To make matters more confusing,
some resources only had 3 My Timesheet line items in the Resource Availability page for the same period. So it seems like something other than active timesheets for the period is dictating how many My Timesheet lines display. Also curious was the
fact that ALL of the My Timesheet items for all users in the Resource Availability page (7 or 8 people) showed "0h" for all of the periods displayed.
I decided to look into this further in a separate Project Server environment, because I didn't have access to the first one at the time. Both environments were configured to not use single entry mode and used resource plans to calculate allocation.
In this second environment, I entered hours against an administrative task classified as non-working time for one week and submitted / approved this sheet. I entered hours against a project task for a second week and submitted / approved this sheet.
I then used the Resource Availability page and "reported" on a period including those periods (20-week period total). I didn't see a single My Timesheet item. Not even any showing the "0h" designation I had seen in the first environment.
So long story short, I cannot figure out the criteria that dictates when a My Timesheet item displays. And I also can't figure out the purpose. If the Resource Availability page is designed to show planned work (either through the planned allocations
stored in resource plans or planned assignments through project schedules), what is the point of the My Timesheet values? Wouldn't planned work be captured in the project line items? If it's for administrative, non-working time only, why would
the My Timesheet items not show up in the second environment scenario? Any help / insight would be appreciated.

Hi,
After investing a lot of time i found one link which is talking about My Timesheet in resource availability page.
I believe link providing proper explanation though i would like to test it on my system.
http://social.technet.microsoft.com/Forums/en-US/projectserver2010general/thread/83e46a4d-3c05-4dda-8566-669b12b673f4
kirtesh

Here is what to look for when you battery goes bad

http://gallery.me.com/cid.dennis#100024/Bad%20battery%202
http://gallery.me.com/cid.dennis#100024/Bad%20battery%203&bgcolor=black
http://gallery.me.com/cid.dennis#100024/Bad%20battery&bgcolor=black
Apple support says after your battery will no longer take a change it will start to do this. I have had two batteries do this. The strange thing is the battery did not look like this on friday but it keep expanding even though I took it out of the laptop. I am waiting to see how big it gets.

Bummer! When the recall was in effect, they considered the swelling and distortion to be the sign of a defective battery. On that theory, some people have been able to get free replacements, but evidently not you. I guess it's just the luck of the draw on whether you get an Apple guy who thinks it should be replaced at no cost to you or one that doesn't.

What determines when logs get rotated?

I need to write a script to parse /private/var/log/secure.log and create a report consisting of the time and userid of each login. But secure.log gets archived periodically, and then the archives get deleted, so I need to time the execution of this script to whatever it is that triggers this archiving so I can record the logins before the log gets rotated.
Looking at the logs and archives, it's a little hard to tell what's going on.
% ls -l /private/var/log/secure.*
-rw-r----- 1 root admin 8153 Jul 24 21:37 /private/var/log/secure.log
-rw-r----- 1 root admin 2232 Jul 21 23:16 /private/var/log/secure.log.0.gz
-rw-r----- 1 root admin 2196 Jul 7 08:21 /private/var/log/secure.log.1.gz
-rw------- 1 root admin 6275 Jun 29 22:29 /private/var/log/secure.log.2.gz
The time intervals are not the same, and neither are the file sizes, so the logs don't appear to get rotated on a regular schedule or when they reach a certain size. It does seem to happen between logins, I think.
/private/etc/periodic/daily/100.clean-logs looks like it deletes old logs, but it isn't involved in archiving or deleting archived logs. /private/etc/periodic/daily/500.daily has a routine for archiving logs, but I don't understand it well enough to see what triggers it.

I've written the script for doing user accounting on the Panther machines, but I'm still having trouble understanding what's going on on my own machine. I'm not positive, but I think there might be some serious problems with launchd and how it manages logs. Something is definitely not right.
According to the documentation Mark referred me to,
Beginning in Mac OS X v10.4, the preferred way to add a timed job is to use a launchd(8) timed job. A launchd timed job is similar to a cron(8) job, with two key differences:
* Each launchd job is described by a separate file. This means that you can add launchd timed jobs by simply adding or removing a file.
* If the computer is asleep at the designated time, a launchd job executes as soon as the computer wakes. This is similar to the behavior of anacron and other cron replacements).
From what I'm seeing, this simply isn't happening. Look at the listing I posted above:
% ls -l /private/var/log/secure.*
-rw-r----- 1 root admin 8153 Jul 24 21:37 /private/var/log/secure.log
-rw-r----- 1 root admin 2232 Jul 21 23:16 /private/var/log/secure.log.0.gz
-rw-r----- 1 root admin 2196 Jul 7 08:21 /private/var/log/secure.log.1.gz
-rw------- 1 root admin 6275 Jun 29 22:29 /private/var/log/secure.log.2.gz
This log is rotated by the script /private/etc/periodic/weekly/500.weekly, but it clearly isn't being rotated weekly. The dates the three archives were created fall on a Friday and two Saturdays, and there is a two week gap between 0 and 1. I am positive that my laptop was not asleep for a week or more. I use it every day. I noticed that the permissions on secure.log.2.gz are wrong, but I don't think that's the cause of the problem. It's just another sign of the hinkiness that abounds here.
The situation looks even stranger when you look at the dates of the first and last entries in each file:
secure.log.2: Jun 19 22:34:51 - Jun 29 22:29:19
secure.log.1: Jun 30 20:15:36 - Jul 7 08:20:33
secure.log.0: Jul 7 11:33:01 - Jul 21 23:16:07
secure.log: Jul 22 15:35:03 - Jul 27 22:43:46 (and counting)
So it looks secure.log.0 and secure.log.2 were truncated and archived around midnight--different days of the week, but at least they avoided getting entries from the same date in two different files. But look at secure.log.1. 8:21 in the morning??? Why???? It's not like it was asleep or anything. I had been using it until around 12:30, and started in again at around 6:30 Saturday morning. Why does it decide it's time to rotate the log at 8:21? And this is after it has already waited two weeks!
So if you're doing user accounting on a weekly basis, this just isn't helpful, and it sure isn't helpful if you're trying to do it monthly. You basically need to re-concatenate the files and split them out by grepping the dates. In other words, before you can do what you need to do, you have to undo what the periodic maintenance routines have done.
And you have to hope they haven't destroyed the records you need.
Among all the other mysteries I'm trying to sort out, I'm trying to understand why the /private/etc/periodic/monthly/500.monthly script didn't run at the end of June. One thing I can't do is go back and look at the system.log, because they rotate them daily (or they intend to, but this doesn't work correctly either) and only keep the last seven. Here's what the log rotation script looks like:
for i in system.log; do
if \[ -f "${i}" \]; then
printf %s " ${i}"
if \[ -x /usr/bin/gzip \]; then gzext=".gz"; else gzext=""; fi
if \[ -f "${i}.6${gzext}" \]; then mv -f "${i}.6${gzext}" "${i}.7${gzext}"; fi
if \[ -f "${i}.5${gzext}" \]; then mv -f "${i}.5${gzext}" "${i}.6${gzext}"; fi
if \[ -f "${i}.4${gzext}" \]; then mv -f "${i}.4${gzext}" "${i}.5${gzext}"; fi
if \[ -f "${i}.3${gzext}" \]; then mv -f "${i}.3${gzext}" "${i}.4${gzext}"; fi
if \[ -f "${i}.2${gzext}" \]; then mv -f "${i}.2${gzext}" "${i}.3${gzext}"; fi
if \[ -f "${i}.1${gzext}" \]; then mv -f "${i}.1${gzext}" "${i}.2${gzext}"; fi
if \[ -f "${i}.0${gzext}" \]; then mv -f "${i}.0${gzext}" "${i}.1${gzext}"; fi
if \[ -f "${i}" \]; then
touch "${i}.$$" && chmod 640 "${i}.$$" && chown root:admin "${i}.$$"
mv -f "${i}" "${i}.0" && mv "${i}.$$" "${i}" && if \[ -x /usr/bin/gzip \]; then
gzip -9 "${i}.0"; fi
fi
fi
done
That last part is just plain weird. They get done rotating all the gzipped archives, and then they need to test to see if there is a new log file, and if not, create one, then archive it. Archive an empty log??? What for? Don't you want to see if there's a current log, and that it has at least one line of data in it, before you start the whole process? Why bother rotating logs if there's no new information? And then, after they archive it, they don't create a new log? All of the other log rotation scripts archive the current log then create a new one. Why should this one be different? This just looks like a mistake.
Also, I'm not the most experienced shell scripter, but isn't this just plain crude and ugly? Instead of using a loop to do a repetetive task, with a variable you can change to set a limit on the number of iterations, they've hard-coded each step. And this is in the script that we're not supposed to change, and it can't be overridden. Nice.
So if we want to change how frequently our log files get trashed, we need to write a daily.local script that takes the truncated, archived files and decompresses them, concatenates them, and puts them somewhere out of harms way? Is that how we're supposed to proceed? Follow them around and undo what they do then try to do it right? Heaping more ugliness upon ugliness?
And keep in mind that the timing mechanism that controls it all is broken, and if you want to do your monthly reports at the end of the month, or your weekly reports at the end of the week, you either have to wait around until this byzantine Rube Goldberg machine spits out the logs you need or go to the terminal and call periodic to run whatever process you want it to run manually after all.
I am starting to wish I'd never looked at this.

Duration of PageFlow - What determines when a user is done?

Hi All,
I am having a problem where data that I store in the pageFlow scope is being destroyed before the user is done using the flow.
There is a reference to the lifetime of the flow here:
http://e-docs.bea.com/workshop/docs81/doc/en/workshop/guide/netui/guide/conDatabindingXScript.html?skipReload=true
It says:
“data is maintained separately for each user for the duration of the page flow.”
My question: What defines the duration of the page flow?
Thanks in advance for any help or pointers to documentation,
Chris

Answering my own question:
From http://dev2dev.bea.com/products/wlworkshop81/articles/wlw_internals.jsp
The lifetime of a JPF depends on the actions taken
in the page flow. In general, a page flow is
instantiated when it is first requested (either the JPF
or one of its JSPs/actions) and is released when the user exits the page flow. The user exists the page flow
if there is a request for another page flow (or a
JSP/action in another page flow). The current page flow is also released when the HTTP session expires. Message was edited by cope360 at Jan 13, 2005 4:07 PM

What happends when there is an "x" showing in the battery and is not charging when the charger is connected?

on the top right hand corner where the date and time and sound and wifi and battery symbols are, i have my battery symbole set up to show me how much battery life i have by how full the battery icon is, but how instead there is a little "x" icon int the battery symbol and i can only use my mac when the charger is connected, but it still says it isnt charging........***

I have the same problem.. X icon.. Battery indicator LEDs are not showing anything.. we might think battery is bad.. but while booting with AC adapter.. if I remove the plug.. it boots and work with battery fine.. but if I reconnect the AC adapter it goes to sleep mode or maybe just LCD shuts off.. I'm sure of it.. im suing mid 2009 version and I'm gettin a 3 1/2 hrs backup until yesterday.. I was replacing corsair RAM 8 GB one and for the battery connecter.. I use flat screw driver to lift it.. saw a tiny spark then.. thinking thats the cause of all this.. physically everything is fine.. except I need AC adapter to start the laptop.. I wonder if we'll get the exact reason of this anytime..
By the way tried everything.. SMC, NRAM.. those things etc.. nothing solves.. just learnt living with it..

How do know when your ipod battery is bad

how do you know when your ipod battery is bad

Does it hold a charge? Can your device be charged? Does it have a good battery life?
If you answered no to any of these questions, your battery is bad.

What does that mean when your iPod only charges when you battery dies? (meaning: when my battery isn't dead it wont charge but when the battery is dead thats the only time it will charge)

What does that mean when your iPod only charges when you battery dies? (meaning: when my battery isn't dead it wont charge but when the battery is dead thats the only time it will charge)

- See:
iPod touch: Hardware troubleshooting
- Try another cable. Some 5G iPods were shipped with Lightning cable that were either initially defective or failed after short use.
- Try another charging source
- Inspect the dock connector on the iPod for bent or missing contacts, foreign material, corroded contacts, broken, missing or cracked plastic.
- Make an appointment at the Genius Bar of an Apple store.
Apple Retail Store - Genius Bar

My IPAD 4 is not working properly. it will blink and then shut down even when the battery is charged. i have done several reset on the iad. what do i do , i need help

my IPAD 4 is not working properly. it will blink and then shut down even when the battery is charged. i have done several reset on the iad. what do i do , i need help

iOS: Device unexpectedly restarts, displays Apple logo, or powers off
http://support.apple.com/kb/TS5356
 Cheers, Tom

What determines which inputs you can select from when you're creating a VISA Resource Name Constant?

Hey, I'm trying to write a labview driver an instrument. I have another instrument which came with labview drivers, and I had hoped that by looking at how they did it, I could write my own for this piece of equipment.
However, the problem is they use the old visa open method. That is, they input a string, "GPIB::6", and it outputs a visa session.
The new Visa open requires that you have an input resource name, and the constants only let me pick from "COM1" and "LPT1", but the GPIB interface card in this computer is in a PCMCIA slot.
What determines what choices you get when you select the value of the constant?
Thanks,
-Dobbs

If you created a VISA Resource Name control, right click on the control and select "Allow Undefined Names".
I haven't programmed directly using VISA on LabVIEW 6 but it apppears that if you select from the drop-down menu, it shows the devices that is defined in MAX. Thus, you should be able to select your GPIB resource name if it has been properly installed.
Nevertheless, it still allows you to override the control by selecting "Allow Undefined Names".
I hope that helps.
Shan Pin Koh

What happens when you take your iPod into the apple store for battery replacement?

I am taking mine in tomorrow. How do they decide if your battery is bad enough to get the iPod/battery replaced? What do they do with your iPod? Do they mess with the apps and data?? Do they search your history to see what you've done on it? HELP!

By reading the following, Apple exchanges your iPod for a refurbished (includes new battery) iPod. Data is no preserved/restore to the replacement
Apple - Support - iPod - Service FAQ
Will the data on my iPod be preserved?
No. You will receive a replacement iPod that will not contain any of your data, songs, or after-market personalizations. Before you submit your iPod for service, it is your responsibility to keep a separate backup copy of the data stored on your iPod and reinstall that data.
Attention iPod touch customers: Before obtaining service, it is important to back up your data using iCloud or iTunes. Apple is not responsible for the loss of information while servicing your iPod touch and does not offer any data transfer service.
Following service your replacement iPod touch may have a newer operating system (iOS) version and you will need to restore your data using the method used to back it up (iCloud or iTunes). As a result, you may also need to update your App Store applications to ensure compatibility with the newer iOS. If you experience a problem with an application purchased from the App Store, check iTunes to see if an update is available or contact the application vendor directly.
However, I have heard in this forum that sometimes Apple will just replace the battery.
If you are concerned I would do one fine sync/backup and then go to Settings>General>Reset>Ease aall content and settings.

My 1-year old MacBook Pro Retina shuts itself without giving a warning when the battery is at 5-15% of capacity. Idk what to do about it.

My 1-year old MacBook Pro Retina shuts itself without giving a warning when the battery is at 5-15% of capacity. Idk what to do about it.

KarnPS,
start recharging your battery when it gets down to 20% — you’ll shorten your battery’s lifespan by running on battery power beyond that.

I want to know what happens when the iPad battery gets fully charged and the charger is still connected

When the battery gets fully charged, and the charger is still connected to the iPad, does the iPad use power from the battery or does it use the charger?

Install Battery Doctor and see Battery Status or Charging
http://itunes.apple.com/tw/app/battery-doctor-hd/id459702901?mt=8
System Status will indicate charged when charging circuit is disabled
http://itunes.apple.com/sg/app/system-status-activity-manager/id401457165?mt=8&l s=1

What happens when you format your iPod in windows?

I had been having major problems with my iPod... you know not getting recognised on the PC. I read a thread that said format it. So off I went thinking that the iPod still didn't work on the laptop. connected the ipod tried a restore, but was told there was an error. remembered someone writing that an ipod could be fromatted in windows to solve the problem. did that, updated itunes. laptop asked again to restore then came up that the ipod was not recognised in the restore program. all I get now on the ipod screen is the apple and a folder with exclamation saying www.apple.com/support/ipod. what do I do from here?

On in this case, have a read the following:-
If a sad iPod icon or an exclamation point and folder icon appears on your iPod’s screen, or with sounds of clicking or HD whirring, it is usually the sign of a hard drive problem and you have the power to do something about it now. Your silver bullet of resolving your iPod issue – is to restore your iPod to factory settings.
http://docs.info.apple.com/article.html?artnum=60983
If you're having trouble, try these steps at different levels one at a time until the issue is resolved. These steps will often whip your iPod back into shape.
Make sure you do all the following “TRYs”
A. Try to wait 30 minutes while iPod is charging.
B. Try another FireWire or USB through Dock Connector cable.
C. Try another FireWire or USB port on your computer .
D. Try to disconnect all devices from your computer's FireWire and USB ports.
E. Try to download and install the latest version of iPod software and iTunes
http://www.apple.com/ipod/download/
http://www.apple.com/itunes/download/
F. Try these five steps (known as the five Rs) and it would conquer most iPod issues.
http://www.apple.com/support/ipod/five_rs/
G. Try to put the iPod into Disk Mode if it fails to appear on the desktop
http://docs.info.apple.com/article.html?artnum=93651
If none of these steps address the issue, you may need to go to Intermediate level listed below in logical order. Check from the top of the lists to see if that is what keeping iPod from appearing on your computer in order for doing the Restore.
Intermediate Level
A. Try to connect your iPod with another computer with the iPod updater pre-installed.
B. Still can’t see your iPod, put it in Disk Mode and connect with a computer, instead of doing a Restore on iPod Updater. Go and format the iPod instead.
For Mac computer
1. Open the disk utility, hope your iPod appears there (left hand side), highlight it
2. Go to Tab “Partition”, click either “Delete” or “Partition”, if fails, skip this step and go to 3
3. Go to Tab “Erase” , choose Volume Format as “MAC OS Extended (Journaled), and click Erase, again if fails, skip it and go to 4
4. Same as step 3, but open the “Security Options....” and choose “Zero Out Data” before click Erase. It will take 1 to 2 hours to complete.
5. Eject your iPod and do a Reset
6. Open the iPod Updater and click “Restore”
For Window computer
Go to folder “My Computer”
Hope you can see your iPod there and right click on the iPod
Choose “Format”. Ensure the settings are at “Default” and that “Quick Format” is not checked
Now select “Format”
Eject your iPod and do a Reset
Open the iPod Updater and click “Restore”
In case you do not manage to do a “Format” on a window computer, try to use some 3rd party disk utility software, e.g.“Partition Magic”.
C. Windows users having trouble with their iPods should locate a Mac user. In many cases when an iPod won't show up on a PC that it will show up on the Mac. Then it can be restored. When the PC user returns to his computer the iPod will be recognized by the PC, reformatted for the PC, and usable again. By the way, it works in reverse too. A Mac user often can get his iPod back by connecting it to a PC and restoring it.
Tips
a. It does not matter whether the format is completed or not, the key is to erase (or partly) the corrupted firmware files on the Hard Drive of the iPod. After that, when the iPod re-connected with a computer, it will be recognized as an fresh external hard drive, it will show up on the iPod updater.
b. It is not a difficult issue for a Mac user to find a window base computer, for a PC user, if they can’t find any Mac user, they can go to a nearest Apple Shop for a favor.
c. You may need to switch around the PC and Mac, try to do several attempts between “Format” and “Restore”
http://discussions.apple.com/thread.jspa?messageID=2364921&#2364921
Advance Level
A. Diagnostic mode solution
If you have tried trouble shooting your iPod to no avail after all the steps above, chances are your iPod has a hardware problem. The iPod's built-in Diagnostic Mode is a quick and easy way to determine if you have a "bad" iPod.
You need to restart your iPod before putting it into Diagnostic Mode. Check that your hold switch is off by sliding the switch away from the headphone jack. Toggle it on and off to be safe.
Press and hold the following combination of buttons simultaneously for approximately 10 seconds to reset the iPod.
iPod 1G to 3G: "Menu" and "Play/Pause"
iPod 4G+ (includes Photo, Nano, Video, and Mini): "Menu" and "Select"
The Apple logo will appear and you should feel the hard drive spinning up. Press and hold the following sequence of buttons:
iPod 1G to 3G: "REW", "FFW" and "Select"
iPod 4G+ (includes Photo, Nano, Video, and Mini): "Back" and "Select"
You will hear an audible chirp sound (3G models and higher) and the Apple logo should appear backwards. You are now in Diagnostic Mode. Navigate the list of tests using "REW" and "FFW". The scroll wheel will not function while in diagnostic mode. For further details on Diagnostic mode can be found at http://www.methodshop.com/mp3/ipodsupport/diagnosticmode/
Try to do the 5in1, HDD R/W and HDD scan tests. Some successful cases have been reported after the running the few tests under the Diagnostic mode. In case it does not work in your case, and the scan tests reports show some errors then it proves your iPod has a hardware problem and it needs a repairing service.
B. Format your iPod with a start disk
I have not tried this solution myself, I heard that there were few successful cases that the users managed to get their iPod (you must put your iPod in disk mode before connecting with a computer) mounted by the computer, which was booted by a system startup disk. For Mac, you can use the Disk Utility (on the Tiger OS system disk), for PC user, you can use the window OS system disk. Try to find a way to reformat your iPod, again it does not matter which format (FAT32, NTFS or HFS+) you choose, the key is to erase the corrupted system files on the iPod. Then eject your iPod and do a Reset to switch out from Disk Mode. Reboot your computer at the normal way, connect your iPod back with it, open the iPod updater, and hopefully your iPod will appear there for the Restore.
If none of these steps address the issue, your iPod may need to be repaired.
Consider setting up a mail-in repair for your iPod http://depot.info.apple.com/ipod/
Or visit your local Apple Retail Store http://www.apple.com/retail/
In case your iPod is no longer covered by the warranty and you want to find a second repairing company, you can try iPodResQ at your own risk
http://www.ipodresq.com/index.php
Just in case that you are at the following situation
Your iPod warranty is expired
You don’t want to pay any service charges
You are prepared to buy a new one
You can’t accept the re-sell value of your broken iPod
Rather than leave your iPod as paper-weight or throw it away.
You can try the following, but again, only do it as your last resort and at your own risk.
Warning ! – It may or may not manage to solve your problem, and with a risk that you may further damage your iPod, which end up as an expensive paper weight or you need to pay more higher repairing cost. Therefore, please re-consider again whether you want to try the next level
Last Resort Level
1. . Disconnecting the Hard Drive and battery inside the iPod – Warning !! Your iPod warranty will be waived once you open the iPod.
In Hong Kong there are some electronic shops offering an iPod service for Sad iPod, the first thing they do is to open up the iPod’s case and disconnecting the battery and the Hard Drive from the main board of the iPod. Wait for 5-10 minutes and reconnecting them back. The reason behind which I can think of is to do a fully reset of a processor of the iPod. In case you want do it itself and you believe that you are good on fixing the electronics devices and have experience to deal with small bits of electronic parts, then you can read the following of how to open the iPod case for battery replacement (with pictures)
http://www.kokopellimusic.us/KM_instructions.htm
Have I tried this myself? No, I am afraid to do it myself as I am squeamish about tinkering inside electronic devices, I have few experiences that either I broke the parts (which are normally tiny or fragile) or failed to put the parts back to the main case. Therefore, I agree with suggestion to have it fixed by a Pro.
2. Do a search on Google and some topics on this discussion forum about “Sad iPod”
What should I do with my iPod? Send it or keep it?
http://discussions.apple.com/thread.jspa?threadID=469080&tstart=0
Strange error on iPod (probably death)
http://discussions.apple.com/thread.jspa?threadID=435160&start=0&tstart=0
Sad Face on iPod for no apparent reason
http://discussions.apple.com/thread.jspa?threadID=336342&start=0&tstart=0
Meeting the Sad iPod icon
http://askpang.typepad.com/relevanthistory/2004/11/meeting_thesad.html#comment-10519524
Sad faced iPod, but my computer won’t recognize it?
http://discussions.apple.com/thread.jspa?messageID=2236095#2236095
iPod Photo: unhappy icon + warranty question
http://discussions.apple.com/thread.jspa?messageID=2233746#2233746
4th Gen iPod Users - are we all having the same problem?
http://discussions.apple.com/message.jspa?messageID=2235623#2235623
Low Battery, and clicking sounds
http://discussions.apple.com/thread.jspa?messageID=2237714#2237714
Sad faced iPod, but my computer won’t recognize it
http://discussions.apple.com/thread.jspa?messageID=2242018#2242018
Sad iPod solution
http://discussions.apple.com/thread.jspa?threadID=412033&tstart=0
Re: try to restore ipod and it says "can't mount ipod"
http://discussions.apple.com/thread.jspa?threadID=443659&tstart=30
I am not suggesting that you should follow as well, but just read them as your reference. You are the person to make the call.

What determines when a battery is bad?

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