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problem with Bios

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Name: Mark
Date: November 13, 2003 at 16:42:14 Pacific
OS: win 95
CPU/Ram: 66/18
Comment:

Dear all,

I having problem with my PC, when start up computer, message comes up saying:
system CMOS checksum bad-run setup

as a result does not run the OS and the computer does not recognise the hard disk, so every time have to go to bios setup and to detect the hard disk then it run fine. when switch off the computer and switch it on again the same thing happen.
so some thing wrong with bios, the bios system is very old one, is there any where can upgrade the bios.
finaly sorry to say my PC an old one, 486 one.

thanks all



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Response Number 1
Name: anenefan
Date: November 13, 2003 at 16:47:34 Pacific
Reply:

Hi


Bios battery

cheers anenefan


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Response Number 2
Name: MaadhuriMN
Date: November 13, 2003 at 16:52:12 Pacific
Reply:

Yeah, replace the CMOS battery and then enter the BIOS Setup and choose to Restore Defaults, Save changes & Exit to Reboot.


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Response Number 3
Name: Mark
Date: November 13, 2003 at 16:57:41 Pacific
Reply:

Dear MaadhuriMN, anenefan and all


thanks, where the battery and how to reomve it, sorry not good in hardware.

another question, how to backbios on follpy disk, is it possible this??

thanks


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Response Number 4
Name: hank
Date: November 13, 2003 at 17:04:52 Pacific
Reply:

The battery is usually a silver colored metal objust about the size of a very think quarter located on the motherboard.

Don't worry about backing up the Bios. They fail about every other millennium.


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Response Number 5
Name: MaadhuriMN
Date: November 13, 2003 at 17:09:42 Pacific
Reply:

If you can post the make & Model of your brand name PC as displayed on its case or the Make & model of the Motherboard if it is A Custom built PC we may be able to tell you what type of CMOS battery it has and where it could be located. Current Motherboards have a coin-shaped NiCd battery This link will show how a CMOS 'Coin' battery looks like.



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Response Number 6
Name: TheGorx
Date: November 13, 2003 at 17:10:10 Pacific
Reply:

first I'd test the battery
you might just have to reset the cmos jumper
check your motherboard manual for instructions and warnings.


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Response Number 7
Name: Mark
Date: November 13, 2003 at 17:38:22 Pacific
Reply:

Dear MaadhuriMN and all,

thanks for the help, the computer is very old, it is 486, do not the what make and model, nothing on the back.

I opened the computer and can not see any battery on the motherboard.

it is old motherboard, you can see for example the harddisk is connected to the card not straight to motherboard as you see with the new pc.

note: the main problem with the bios only the hard disk, every time switch off and on, the motherboard does not recognise the harddisk.


thanks


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Response Number 8
Name: anenefan
Date: November 13, 2003 at 18:16:06 Pacific
Reply:

Hi again

It comes as no suprise the motherboard has very little identification on it. Take a very good study of the board. Look for a barrel shaped object about 12mm (1/2 in) round and about 19mm (3/4) long. It may have on it Ni/Cd or + and - on eah end. Hopefully there will be voltage on it as well (like 3v).

Have a look and post back.

Some earlier boards used a capacitor instead.



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Response Number 9
Name: MaadhuriMN
Date: November 13, 2003 at 20:19:58 Pacific
Reply:

Mark,
Many older IBM type Motherboards used the Rayovac 840 Alkaline CMOS batteries. Here is a link to an image to such a 4.5 volt Alkaline CMOS Battery (840 compatible)



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Response Number 10
Name: MaadhuriMN
Date: November 13, 2003 at 20:33:44 Pacific
Reply:

As an after thought, unless you are very much sentimentally attached to this vintage, it is better to either buy or build a PC with P4 or AMD athlon CPU, on Mobos with very fast FSB and DDR RAM, Large IDE HDDS with 7200 RPM, FAST CDRWs etc for a fraction of the cost you might have paid for this 486! From cartoned case, and boxed Mob, CPU, ADD-On cards, FDD,HDD, CDDs to a Windows PC logging on to the the Internet may take 6-8 hrs for as low as US$ 350-.......depending upon what you want inside the chassis!:-)


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Response Number 11
Name: Mark
Date: November 14, 2003 at 05:56:26 Pacific
Reply:

Dear MaadhuriMN,anenefan and all,

Thanks lots for the help, it is sorted, it was the battery and found it.

thanks


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Response Number 12
Name: MaadhuriMN
Date: November 14, 2003 at 06:51:22 Pacific
Reply:

Mark,

Glad to know you located the CMOS battery on your Motherboard. I hope it is the Coin-shaped Lithium Battery [I regret the error made in calling it a NiCd battery in my response #5] priced about US$2.00[Example:SONY CR1216 Lithium Coin 3V, 30 mAh, Blister, 1 pcs]


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