yes
The power switch.
if the motherboard is designed for the case fan you are using its best to plug it into the motherboard, this will free up a spot on the power supply. Otherwise as long as the voltage and amps are the same it doesn't really matter. If you try to plug it into both you will double the power of the fan and very likely fry the fan.
items of a motherboard
A PC Main Supply is what gives the computer power to operate, in desktop computers they have to constantly be connected to some type of power outlet. Diagram. Plug socket > Cable > PSU (power supply unit) > Motherboard > power to all components in the computer.
All of these are connected to the motherboard:CPUHard DrivesCD/DVD optical disc driveGraphics CardYou can also argue that the power supply is plugged into the motherboard to supply power to it
The remote switch wire for an ATX or BTX power switch is typically connected to the motherboard's front panel header. This header is where you connect various front panel connectors, including the power switch, reset switch, power LED, and HDD LED. The specific pins differ depending on the motherboard model, so it's important to consult the motherboard manual for the correct connection.
In both ATX and BTX power supplies, the remote switch wire from the case must be connected to the motherboard's power switch header or pins. This connection allows the power supply to be turned on/off using the computer's power button.
The motherboard doesn't actually produce any of its own power. It acts as a mediator between the power supply which it is connected to and other components. Most parts found inside a tower are powered in this way but certain parts such as the monitor and specific external hard drives plug directly into an outlet. Wireless keyboards and mice are also exceptions being that they have their own batteries.
A rather simplistic answer is: The keyboard is an input device, and is plugged into the computer tower, and thus is connected to the motherboard and processor, etc. The monitor is an output device and shows the graphical output from the motherboard for the user to see on the screen.
The beep indicates that the power is connected. BTW - try this out, unplug the power from the outlet and plug just the power to the laptop. Notice, the beep will still sound.
An internal hard-drive fits into a bay inside the computer's tower. A power cable from the power unit is plugged into the hard-drive. A data cable plugs the hard-drive into the motherboard.
Make sure the rest of the house/office has electricity.Check plug socket is on.Check Power supply is turned onCheck power cable is plugged into the backCheck power supply is connected to motherboardIf it is, see if the PSU fans spin up when turned onIf not use a PSU testerIf all is OK test motherboard.