MotherBoard died

i got a rma for a new 1 its the same modle board do i have to reinstall windows again & download all myn stuff back 

No all of that is in your harddrive. You might have to reinstall some drivers for the motherboard tho.

i collect broken computer parts and recycle them

 mobos are worth something like $30 a kg at the scrap yard as they have precious metals in them like gold

Really i got an old mini atx intel wow good to know