This is why doing some research always helps especially if the board is from a well known brand as some early 370 boards only support the older Celerons due to the vrm spec and bios not supporting coppermine.

ElDavo wrote:

So I've got a socket 370 motherboard and I put a pentium 3 coppermine 800mhz processor in it and......nothing. No beeps, no video nothing. after trying different video cards
and different ram, also running a D-sub from the motherboards onboard graphics I still got nothing. I read the manual and apparently this motherboard will only accept fc-pga chips and not ppga.

how can I identify an fc-pga processor? been trying to figure this out for ages and now my brain hurts. 😢

If it is a Pentium III it is FC-PGA. the PPGA CPUs were a short lived budget platform and consisted only of a bunch of Celerons (up to 533Mhz). That was annoying because getting one of those PPGA systems left you without any upgrade path. I still have one of those somewhere.