Hello, I have a Dell Latitude C640 that has worked perfectly for a very long time. But all of a sudden one day when I turned it on it kept shutting off after just a few seconds. If I try to turn it on with only the AC adapter connected (no battery) it usually requires that I push the start button a few times before it will turn on, but then it will shut down after a few seconds. If I try to turn it on with just the battery connected (no AC adapter) it will turn on the first time I push the start button, but then it shuts down after a few seconds. After a few times of trying either of these methods to start the laptop it won't start at all and I will need to wait a while before trying again. Regardless of which way I get it to start, I notice that both the CPU fan and case fan are not spinning at all. What would be common to both the CPU fan and the case fan not spinning at all? Is it possible the laptop is overheating in just a few seconds, and this is what is causing it to shut down? Thank you!
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Sounds like the fan may be failing and need replacement. On a system that age, it is debatable whether it is worth fixing.
You can boot to he resource cd and run fan diags is you want to try and confirm
Both Dell Part numbers 18THT and 5W299 are 8X DVD-ROM Drive Modules. DPN 18THT is compatible with Latitude C series and DPN 5W299 is compatible with Latitude D series. The two drives have different and incompatible connectors.
Your Latitude C640 is a C Series Latitude. You can therefore not use DPN 5W299.
If you need a DVD drive module, get DPN 18THT or an alternative Latitude C series drive.
just log on to support.dell.com
click on drivers and download
punchin your system's servica tag
download BIOS updates
but it will only be done if ac adapter and battery are both connected if its not
than it could be an issue with the systemboard and will be replaced if you live in US call 1-800-624-9896(DELL)
There would be no way to know if that is the case without opening the machine. I suggest taking it to a certified laptop repair technician near you ( a Dell Store if under warranty ), and explaining the issue to them. I have not seen this happen myself ( the heatsink popping off ) but that's not to say it can't happen. I suggest having the laptop looked at sooner than later, as each time you turn it on and it overheats it reduces the life expectancy of your unit.
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