If i have to replace the motherboard how do i find out which one i need.
You really need to read this - http://www.techspot.com/vb/topic33297.html
Give us the specs of the motherboard you want to replace. Specs like make, model, processor and memory type
CPU-Z, Everest, and/or SIS Sandra will give you a lot of infromation.
My Laptop is a Fujitsu Simens Amilo M3438G, 1 gig ram,100gig harddrive,chipset intel 915PM+ICH6M,CPU Intel Pentium M Processor (533MHz FSB/2MB SLC).