Computer host boot screen no display method

It is often asked that the computer is still used well last night, but it can't be opened in the morning, and there is no display on the screen. After confirming that the display and the host are connected correctly,
can try first. Next, unplug the power supply behind the main unit (remember to be connected to the back of the mainframe, not to turn off the switch). Press and hold the switch that is normally turned on for about 10 seconds, then connect the power back, then press the switch to turn it on. Do it once, in general, many situations can be opened.
If the host alarms, it will make a drop of sound. In this case, the memory stick is loose. You must unplug the power before you can unplug the memory. Use rubber tape to wipe the gold finger of the memory module (golden contact), then pick it up again