helpP!!! motherboard question..i think

[zcage]

I'm trying to get a new processor b/c mines out dated and really crappy (AMD Athlon 1.09 GHz) My motherboard is GA-7N400 Pro2 and the processors its compatible with are not made anymore

So I was wondering how I can figure out what motherboard fits with my tower (I have a MSI P4 Mainboard) so I'll be able to get a new processor

thank you!