Instructables

Laptop look dead? Try to change the BIOS battery

Hello
A friend gave me an laptop that the motherboard was dead.
This friend contacted HP,they wanted 400$ for reparation
Just repair it in 5 minutes
 
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Step 1: Tools needed

- One philips screwdriver
- One dead computer
- VERY IMPORTANT: One 2032 3V battery
- Optional: Multimeter
gmjhowe5 years ago
Good and simple, i suggest changing your title to 'swapping out a motherboard battery', or something along those lines. It would seem that the laptop is running mac os x?
No, thats xp! I highly doubt that the CMOS battery would stop the computer from booting. The CMOS battery powers the internal clock of the computer and that alone would not cause a complete breakdown, Maybe some errors due to the time being incorrect but NOT broken.
Actually I have seen a bad battery stop a laptop and desktop from booting properly
I ran into this just a week ago with an older Toshiba laptop. Stone dead. No access to the CMOS battery without completely removing the MB from the case. Poor design, or planned obsolescence?
Tututu (author)  phearce1 year ago
Personally, I'd accept the challenge :D
I was just going to say it is one of the troubleshooting questions on the A+ computer certification exam. The CMOS is required or the computer cannot boot, the battery does not just power the clock, however, without a clock the computer cannot run either.  The start up settings are stored in EPROM, which is maintained by that same battery. The computer needs those setting to boot also.

. I've only run into one computer that wouldn't boot with a dead battery and that was ~15 years ago; but I don't see many computers with dead batteries. I think that happens when the HDD params get erased or scrambled (I could boot the computer if I set the drive params after the POST). Most, if not all, recent BIOSes will auto-detect the drive params, so it's not usually a problem nowadays.
Tututu (author)  NachoMahma5 years ago
Yeah maybe But I repair also one other computher that don't wanted to boot It worked good too
It does stop it its happend to me
ah yes, i thort it was a hackintosh, but on closer inspection i see the windows quick launch.
Tututu (author)  gmjhowe3 years ago
Now, I installed Mac OS X Leopard on this laptop, it is so faster than XP, boot in 30 seconds and shut down in 5-6 seconds
buddy033 years ago
I have an old HP xh485 and there is no sign of a CMOS battery, even after opening the top and removing HD and KYBD. Help me find that little guy!
Tututu (author)  buddy033 years ago
Did you check the manual?
buddy03 Tututu3 years ago
I don't have a manual.
Hi,i have exsacly the same computer as u..
its dead to
*thx for making this tut
Tututu (author)  Combine Clite3 years ago
Hi, did you try to replace the battery? Did it worked? Thanks for comment
zack2474 years ago
will a general CR2032 work? or does it have to be specific? they are both 3 volts...
Tututu (author)  zack2474 years ago
 Yes, a general CR2032 3 Volt battery should work.
Just try =)
zack247 Tututu4 years ago
i checked the battery on my multimeter, (on 6v, it doesn't hav a 3v option) and it tested out just fine (the needle was at the halfway mark) should i replace it anyways? or is there something else wrong with my laptop?
Tututu (author)  zack2474 years ago
You don't need to replace it
But take it off for 1 minute and take it back again
It will reset the CMOS and may work
drewwwski4 years ago
Could you desribe the symptoms prior to changing the battery? I've got a Compaq laptop of the same form factor that won't boot into Windows. I had also suspected a bad mobo so thanks for this suggestion, I'll give it a try...
is it a presario v4000 by any chance? i have one, and i am going to try this. i can at least get it to boot up, i can ten get all of the other parts.
Tututu (author)  zack2474 years ago
 Try this, it is a cheap and easy trick.
It may work!
zack247 Tututu4 years ago
mine looks just like yours, the battery is different though, it has wires coming off of it onto the mobo. hopefully (since compaq and hp are one and the same) this will work. i have wanted a laptop for as long as i can remember. wish me luck!
Tututu (author)  drewwwski4 years ago
 A friend of mine gave me the laptop because he went to the Computer shop and they asked 400€ to repair it.
He gave it to me.
The symptoms were that the power button was flashing, and no signal on the screen and no boot.
I changed the battery and everything worked fine =)
Patented5 years ago
Yo, je presume que tu parles francais pcq ton bios est en francais.. mais merci beaucoup je vais essayer sa jai un vieux laptop IMB pi le probleme c le motherboard donc je vais essayer de changer la batterie! merci
Tututu (author)  Patented4 years ago
Salut Et bien essaye,ca ne coute presque rien. Tiens moi au courant ;)
Patented Tututu4 years ago
Ouais ben je lai changé mais non sa a rien changé malheureusement... Merci quand meme pour lidée!
Tututu (author) 5 years ago
Thanks for your reply I just made this instructable because I was wondered when I saw that it works For me it worked great,so just try it before cast it And it is XP,but I saw that the HP G5000 is compatible with Kalyway,so maybe i'm gonna to change And please,rate it
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