Question about Dell Latitude C640 Notebook

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I changed my Cmos battery & my laptop would not start after tha

C640 did not keep time or settings. Replaced the reserve battery and now the unit will not start. I did not copy the bios before changing the battery.

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  • 122 Answers

Without battery, BIOS just gets reset to default and should not effect boot. There is a possibility that you failed to reconnect something important when disassembling the unit.

What exactly happens when the unit turns on?

Posted on Jun 18, 2009

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HI, I have a IBM Thinkpad R50e and i had a CMOS battery failure. After replace the battery it has now started to ask me to check the date and time and when i press enter it is asking for a BIOS...


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After 5 minutes by, put back on the CMOS battery. put it back all together. laptop battery the last one.
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akee_akee@live.com

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The time and date has to be set after shutting off.


The BIOS battery keeps the Date and Time correct, if the battery is flat the date and time will be wrong or you will get an error date and time error.
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Assuming that you used the correct battery go ahead and unplug and replug the cmos batter back into its connector.

Go into the BIOS and set the date and time properly. Then unplug the battery and save the changes and exit.

See if the message comes back, if it doesn't then your good to go. If the message still comes back then the motheroard isn't keeping memeory at all.

Go ahead and shut off the machine for about 15 minutes. Then only plug the ac adapter up and hopefully the message stays away. If it does then that means the battery is good and your motherboard is good as well.

if you leave it off and then turn the laptop on and that error message comes back then you need to change out the motherboard.

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Have laptop that has black screen and says no boot device available every time i turn on computer. what can i do?


Boot to system system BIOS, reset defaults, save settings and reboot, see if the error goes away. If so, then the reserve battery on the mothebroard is bad. If no change, then reseat the Hard Drive, and try again. If still no change, a HDD replacement is likely

Jun 05, 2009 | Dell Latitude C640 Notebook

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Dell Latitude C640 Laptop


get to the main board of ur system there is a jumper near the battery .
change its position while power is off and get it back to its previous position. this way u will reset cmos to default.
if the computer starts hit delete to enter setup and load system defaults.save changes then exit.
ps: defected processor could be the cause

Nov 14, 2007 | Dell Latitude C640 Notebook

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