Solved Problem with booting after replacing cmos battery

April 29, 2012 at 10:31:05
Specs: Windows XP, Intel Pentium 4 3.60GHz/512 Mb
My dell 8400 displayed Alert! System voltage is lopw replace motherboard battery. And so i did... Replaced the old cr2032 with a new one and all was fine until i started the computer. It managed to post alright but when booting windows the screen displayed that windows was not able to boot. This could be due to a change of software or hardware.

And it gives me the option to start windows in safeboot, latest configs. or normally. None of the options work as the computer post successfully but after that the same screen is shown as before.

System setup looks alright but i dont think i would be able to see if something was wrong or not.

Should i just reset to the default bios or could that cause any problems? DOnt want to lose any infromation on my hard disk drives so if rather just throw my computer in the ocean than doing somthing that may cause any damage!!

Thanks for replies! :D

See More: Problem with booting after replacing cmos battery

Report •

April 29, 2012 at 11:14:31
The cmos battery must be installed such that you can see the + on the top of it after it's been installed.

After you have replaced the cmos battery....

You MUST set at least the date and time in the bios Setup to the present settings, Save settings, because the time and date, and any other custom settings in Setup you had before, have reverted to their default settings.

Some programs in Windows cannot work correctly if those are way off.

"Should i just reset to the default bios or could that cause any problems?"

Removing the cmos battery always sets the bios to it's default settings.
Loading default settings in the bios, Saving settings when the battery is okay would probably not cause any problems, and if the time and date were set before you did that, the bios will retain those settings.

However, sometimes you need to change other settings too after the bios has been set to default settings, e.g., if there is more than one internal physical hard drive on your computer .

If doing that doesn't help, if the computer has only one internal physical hard drive and it has only one partition with Windows itself installed on it, you have something else going on that is causing your problem that has nothing to do with you replacing the cmos battery itself.


You may have loosened something inside the case when you were replacing the battery.

Unplug the case/power supply, or switch off the AC power to it otherwise.
Power off your monitor.
Open up the case by removing the left side panel as seen when you're looking at the front of the case.
Check all the connections of the wiring to make sure they are all the way onto their pins and into their sockets, especially the main connector from the power supply. The wires close to the mboard going into the main power connector/socket should be more or less perpendicular to the mboard surface rather than at an angle.
Make sure that the ram and all cards in slots are all the way down in their slots.

You may need to boot the computer from a Windows CD, or the equivalent Recovery CD that came with your computer, in order to fix your problem.

Report •

May 1, 2012 at 05:36:18
Thanks for a quick reply. Tried to change a few settings for hard rives etc but no success. Did take a look at the inside and made sure all of the cables were connected properly but no success.

Think I'll have to look through the old storage of cd's and try to find the Windows bott CD.

If i dont find the cd is it possible to buy one. Is it possible to download a boot setup and load onto a cd or usb flash drive?

Report •

May 1, 2012 at 12:30:34
✔ Best Answer
The most frequent problem we (who regularly answer on this web site) have is the person who started the topic has NOT supplied enough information !!

Have you set the Time and Date in the bios Setup to their current settings, Saved bios settings ?


If YES ....

If setting the Time and Date in the bios didn't fix your problem....

Do you have more than one physical hard drive installed on this computer ?

Has more than one Windows installation been installed on this computer ?

If the answer to those questions is NO, and NO, then.....

You may have changed some setting you shouldn't have changed in the bios.
Go into the bios and load Bios defaults, Save bios settings.

If that doesn't help regarding your problem, if you're sure the ram and all cards in slots are all the way down in their slots, then there's probably something minor that's a problem in Windows that you need to fix.

You need to - boot the computer from a Windows CD, or the equivalent Recovery CD that came with your computer, in order to fix your problem.

( -or - if you have access to another working computer that has Windows XP or 2000 installed on it, you could remove the hard drive that Windows was installed on, and connect your hard drive one way or another to the other computer, do NOT boot that computer from your hard drive, and run CHKDSK /R on the partition Windows was installed on (see below) , on your hard drive.)

Most Dell computers that originally had XP Home or Pro on them that I've worked on came with a Recovery disk, Dell labelling, "XP Home (or Pro) SPx Re-installation CD" or similar.
That disk can be used the same way as a regular Windows CD.

(If your computer has a MCE 200x version on it, it didn't come with that.)

If you don't have that, or you might have that but can't find that, the first thing I'm suggesting you try is to run CHKDSK from a Windows CD you boot the computer from, and for that you can use any XP CD that is not an Upgrade CD
If you don't have one, you may be able to borrow one from someone you know that has a computer that has XP on it.

Boot from the XP CD, load the Recovery Console, run CHKDSK /R C:

For more info,
see response 11 in this:

starting at, scroll down to "If that won't work....."


If running CHKDSK /R doesn't fix your problem.....

Check your hard drive with the manufacturer's diagnostics.
See the latter part of response 1 in this:

If you don't have a floppy drive, you can get a CD image diagnostic utility from most hard drive manufacturer's web sites, but obviously you would need to make a burned CD, preferably a CD-R for best compatibility, on another computer if you need to.

Seagate's Seatools will test (almost) any brand of hard drive.
Do the long test.

The bootable Dos versions of SeaTools can be used even if Windows is not working properly.
If the hard drive itself tests okay, any data problems found can be fixed, one way or another.

If the hard drive itself tests as okay.....

if your computer has XP Home or Pro on it,......

- in order to probably fix your problem WITHOUT you losing your personal data

- the Recovery disk, Dell labelling, "XP Home (or Pro) SPx Re-installation CD" or similar.
- or - a regular MIcrosoft OEM CD for the same version of XP as is on the official Microsoft label on the outside of you case, Home or Pro. That has "for distribution with a new PC only." printed on the CD, and the Microsoft holograms.

Report •
Related Solutions

Ask Question