I was given this Motherboard with a P3-450 installed. It's an ATX, with onboard sound. I don't know who made it, but I want to find out. It has a bar code on the bottom and what I think is a serial # as follows MB-MB862ZX-ATX. Any help is appreciated. Let me know if other details are required.
That's quite an unusual situation. I'm not an expert, but I don't suppose the serial number is going to help. You can either ask the store you got it from or figure out what it is, by knowing what chipset it has on (probably i440bx), how many pci, isa slots it has. That's the best I can think of. If I may ask, Why do you want to know who the manufacterer is anyway?
HMmm.. Been there...
Plug the MB on and turn it on than in the bottom left
corner there will be a number copy it (press Pause in BOOT)
Than there are some sites that take this number apart by vendors and MBs type (I dont remeber thos sites thou .. Sorry).