Well, first of all..compaq service SUCKS..because I have spent 10 minutes and cant find any specs for that model..are you SURE you have the right model number??.....that is a SAD statement about their website....I can find Dell or even Gateway specs in less than a minute.
Anyway, thats not your fault.
First of all, dont buy a motherboard for $193 dollars, lol.
If your case is a standard atx type case then you can buy both a motherboard and cpu for less than $150..plus you will probably need some new memory....for 1 thing 64m isnt enough and if you get a newer faster cpu you will need some faster ram.
you have a 700mhz athlon....can you look at it and tell us if its a "slot A" or a "socket A"
a "slot A" is shaped like an old Pentium 2....its a "cartridge" type....like
this
a socket A is just the modern flat cpu like
this
if the fan is parallel with the motherboard its the socket type cpu..if its sits up perpendicular to the motherboard its the slot a type.
Either way if its just a plain old atx case then you can just get a nice motherboard/cpu/ram setup and have a nice fast system.
for instance
this biostar M7VIZ motherboard with
this $73 athlon xp2200 cpu and get a 256m stick of PC 2700
ram and you have a serious upgrade to what you were using.
JP