Check the motherboard, see if the CPU is installed correctly
The gold arrow on a CPU typically points to the corner of a motherboard socket where it should line up. This is so the CPU is installed correctly.
Since the computer won't work without both of them installed it doesn't matter which is installed first.
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The microprocessor is installed into the CPU socket on the motherboard. A CPU socket can only fit a certain range of microprocessors.
CPU sockets (or CPU slots) in which one or more microprocessors may be installed
You probably have a graphic card installed and have the cable connected to the integrated card or vice versa.
What are three important considerations when installing a CPU on a motherboard?
CPU front side bus RAM clock rate
Some motherboards come with a CPU installed, but it is not, technically, part of the motherboard itself, but part of a substructure known as a chipset.
CPU speed, amount of RAM, and hard drive space.
Yes, these are called micro-processors. If you have a dual-core CPU, it means you have two micro-processors running in your CPU rather than just one.