I have 2 PCs that both need motherboards, and I am having a very hard time finding them. the 1st PC is a HP Pavilion model# a705w I'm hoping I can find one that will work with it since I'm having such a hard time finding the exact one that came with the machine. The 2nd PC is an emachine model# W5243. I can purchase the motherboard for it, but don't want to pay the $150 for it. I'm hoping maybe I can get a cheaper one that will work with it. How do I go about finding motherboards that will work with my PCs? Any help will be much appreciated