yes, this OP
MoBo, CPU, RAM, and PSU are a bare minimum to get the system to POST.
all of these parts must be good. if your RAM is suspect, only use one stick.
monitor is only required to see it post. GPU is needed if the CPU doesn't have integrated graphics.
if you do not have a GPU in the PCIe slots, the CPU will try to put video out any on motherboard connectors.