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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.
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