This is what you are looking for
although I'm not entirely sure that this is the motherboard I'm pretty sure. It is a bit pricey and it may be more then worht it to return the laptop back to dell for repairs, it's a pain in the neck but it may be your only option. Taking a part a laptop to get to the motherboard then replacing the parts on the original motherboard such as the processor and the memory sticks may be difficult for a regular user. You can definately do more damage then good. Good Luck
my motherboard was damaged when my laptop was dropped. some chips came loose and they are not able to be fixed. anyone who who can help me to find a motherboard out there?