Pavillion DV4 mother board replacement

My Pavillion dv4 VM298UA won't charge.  I tried a new battery, charger and DC jack but no luck.  After searching the forums it looks like I need to replace my mother board.  Does anyone have answers to the following questions?
1. What causes a mother board to go bad like this?
2.  If I replace it is there anything I can do to prevent this from happening again?
3.  I have seen new and refurbished boards avaliable with the refurbished ones being about half the cost of new.  Is it ok to use a refurbished one?  The benefit is lower cost, but what is the risk?
4.  Is there anything else that needs to be replaced at the same time?  ie fan, heat sink, etc
5.  The boards I have seen do not come with a processor.  Is it a big deal to take the processor off my existing board and transfer it to the new board?  Any special tools or techniques needed?
6. How likely is it that the mother board is the problem and not something else?  Is there any way to look at the mother board and tell?  Any tests that could be done?
7.  Anything else I should be aware of before I invest any more $ into this thing?
Thinking about this another way, with the hard drive from this computer fit into any other computer?  I really would like to reserect the computer, but wjhat I really need to do is to get some stuff off the hard drive.  Is there another compure I could get that I could plug this HD into?
Are there any post that address these issues that I just haven't found yet?
Any help would be appreciated.

jeanpossenti wrote:
Hello , the mother board notebook burned . How and where can I buy a new one, being in Brazil ?
Check with HP of Brazil or if they have eBay in Brazil and search for your board number to see if there is someone selling a matching board.
I am a Volunteer to help others on here-not a HP employee.
Replies aren't online 24/7 because of Time Zone differences.
Remember in this Day and Age of Computing the Internet is Knowledge at your fingertips if you choose understand it. -2015-

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