COMS checksum is invalid, the COMS will be rest to default

Hi,
Product name: HP Pavilion dv6-6093ex Entertainment Notebook PC support).
Product number: LM610EA#A2N Since I was facing an error 'The system has detected that a cooling fan is not operating correctly, I have cleaned the the fan, and even the heatsink(metal plate) with the paint thinner, and then I rebuild the fan in the heatsink. After that, I have applied new thermal compound on both of the tops of CPU and GPU. Finally: I have put in back my laptop all together.
The error 'The system has detected that a cooling fan is not operating correctly.' no longer appears to me. However, when starting my laptop, I face 'COMS checksum is invalid, the COMS will be rest to default', although I was not facing this error before taking apart my laptop. (Why do I only now face this error 'COMS checksum is invalid, the COMS will be rest to default' ?
The time and date was reset to '01/01/2010 (12:04:44 AM)'
I opened the BIOS, and then updated the time and date to the recent values. However, I saw the time and date came back to the wrong value when shut my laptop down and leave it for about 5 hours and turn it on again.
However, when shutting it down for only minutes, and turn it on again, then I found the new configuration(new data and time) keeps as I set them up.
Do you think that COMS was defective while removing it when taking apart my laptop

Thank you very much indeed for your continual replies.
To my surprise, my laptop was powered up again. But I would like you to kindly concentrate with what I would be going to say below?
1- When my laptop is not powered up when trying powering it up yesterday, I have tried removing the COMS battery and then disconnecting the charger, and pressing the power button and holding it for 1 min. Finally: I waited 10 min and tried to connect the charger and power up the pc. , then it was powered up well.
2- when I powered my laptop up, then the error 'COMS checksum is invalid, the COMS will be reset to default' appeared to me'. Then, I have booted to BIOS, and updated the date and time to the correct values.
3- When I restarted my laptop, then the error 'The system has detected that a cooling fan is not operating correctly.
Continued operation is not recommended and may cause unpredictable behavior that could result in random shutdown, data loss or possible system damage. The system will shut down in 15 seconds. To prevent shutdown and continue operation, press the Enter key now', although I have fixed it by cleaning the fan/heatsink throughly before, and it was not appearing to me.
4- Whenever I now start my laptop, only this error 'the system has detected that a cooling fan is not operating correctly.' appears to me. However, the 'COMS checksum is invalid,.....' no longer appears to me and the date and time are still correct whatever time my laptop stayed shut down.
So, My questions are:
1- do you think that the error 'the system has detected that a cooling fan is not operating correctly.' is related to 'COMS battery as long as when the error 'COMS checksum is invalid,....' appears to me, then the error 'the system has detected that a cooling fan is not operating correctly' doesn't appear to me?
2- Why does the error 'COMS checksum is invalid,....' no longer appear to me when the error 'the system has detected that a cooling fan is not operating correctly.' appears back to me.?

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