You will need
- The system unit, the instruction to the motherboard, the screwdriver "+".
Expand the system unit sideways. Remove the side cover of the unit so that you will not have. Most system units are arranged so that the side walls would slide off easy. As a rule, they are fastened with 2 screws or plastic latches. Use screwdriver + to remove the screws and remove the side wall of the system unit. You need to focus your attention on the wires connected to the loop, which will extend from the front panel to the motherboard. You should see 4-5 pairs of wires, depending on the configuration of the system unit there may be more.
On the connector of each wire that connect to the motherboard, you will see inscriptions in English. It is worth to weed out the ones that you don't need at all: a connector that says USB not useful to you, as well as Reset (reset button of the computer), HDD Led indicator (hard drive activity), Power LED (the led is on power supply unit). You need to find a pair of wires labeled in connector Power Switch (PW Switch), Power ON, On-Off. It all depends on the motherboard manufacturer. Information about the purpose of connectors is also possible to learn from the instruction to the motherboard.
Now unplug the connector that is responsible for turning on the computer. Armed with a ballpoint pen: the thicker the rod, this handle, the better. Connect the 2 bare contact (needle) with the tip of a ballpoint pen. Touch needs to be quick, otherwise the computer will not turn on. At long contact (>5 seconds) on the motherboard of the signal is about turning off the computer. Because the computer you are not on, then turn off you have nothing.
After turning on the computer, it is desirable to eliminate the cause of the malfunction of the system unit.