For anyone confused about the part numbers for the HP G6000 & Compaq F700 series motherboard - PN: 461860-001 is the same as 461861-001 except without the ExpressCard assembly unit. HP references this laptop motherboard as a "system board without ExpressCard assembly (includes replacement thermal material)".
The laptop systemboard's compatibility is still identical as it will work for the Compaq Presario F700 F750 Series and HP G6000 model laptop computers.
Notebook makers are constantly changing and updating the spares part #'s... why, I have no idea. From experience and following the market closely, it seems like a way to confuse customers into buying the laptop part from them direct at a ridiculously high price. I just came across a laptop motherboard that they discontinued the current pn and just changed it along with the price. When researching it, I found no difference and after having both in hand - they were identical in every way. I will do my best to keep everyone updated so no one falls into the trap of overpaying.
COMPAQ PRESARIO F750US F755U MOTHERBOARD 461860-001
Sale Price: $39.90 on eBay.com