Will a Motherboard Post Without a CPU?

Motherboard manufacturers won’t allow posting without a CPU because it would let users build computers with motherboard and CPU of different brands. A motherboard requires a CPU (Central Processing Unit) or microprocessor, which is the present-day name for this type of electronic component. The CPU processes all information that enters or leaves the computer through the motherboard.

Without it, there would be no internal communications between devices such as hard drives and RAM. It also coordinates all operations that take place within the computer itself. To put it another way, every piece of hardware on the motherboard must receive signals from the CPU before anything happens.

Motherboard without a cpu

Posting without a CPU is impossible, actually. The BIOS would need to be hardcoded to allow this, and the manufacturers won’t do that because then users could use one of their boards in other machines.

From a different perspective: Imagine you had a video card with an external power connector, but you couldn’t connect the power connector, because your motherboard doesn’t have any free slots.

If you build a computer for someone else and don’t have the CPUs lying around, it’s probably better to get yourself a brand new motherboard (or CPU), but throw out the hard disks and ram from the old one. Throw away everything except what is connected directly to the motherboard.

Can a CPU work Without a Motherboard?

A CPU is actually made up of two parts: the processor chip, and the heat spreader. The processor chip is mounted on the motherboard and has to be attached to a heat sink or fan in order to cool it down sufficiently so that it doesn’t over-heat.

But not all motherboards have sockets for CPU chips. In fact, most newer ones don’t, because of rising costs for processors: costs in the millions of dollars to build a new cutting-edge CPU. So now most CPUs are soldered directly on the motherboard – instead of being mounted into a socket and thus easily replaceable.

Even if your motherboard is one that still has a CPU socket, it may be damaged or not work at all if you remove the fan/heat sink. The reason: When a computer first boots up and runs its power-on tests, it checks to see if there are 8 volts DC present on each pin of the CPU (this is called “Power Good”). If there is no voltage present for any of these pins, then we know something is really wrong with this PC.

Cpu Without Motherboard

A good CPU will not even run if you apply 12 volts DC instead of 8 volts DC, because it needs a certain (reasonably small) voltage to get its internal clock running at all – and then it can sort of figuring out what’s going on from there.


There is no way of posting without a CPU, and if you want to build a computer for yourself or someone else, throw away everything that isn’t connected directly to the motherboard. If something isn’t working anymore, it may be other things than just the CPU (like maybe some connectors).

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