Could be a bad cable, or a bad graphics card. However, try the simple fix, first. Detach your monitor from the power source and the computer, reattach and then restart the computer. Sometimes the connection to the computer and/or power gets loose, so the computer doesn't "see" it.
If the CPU is running, but the monitor has no signal, there could be an issue with the cable that connects the CPU to the monitor. There could also be a problem with the VGA card, or the RAM.
You probably have a graphic card installed and have the cable connected to the integrated card or vice versa.
Please check the cables connected between your CPU and monitor are not broken and fixed correctly. If cables are ok and connected correctly, check if CPU is running. All new monitors are capable of detecting input signals from multiple sources, if only one signal source is present when monitor is powered on. Else manually change which source to be used by monitor for display.
No.
the input signal is carried to CPU by having a binary numbers.
the monitor is not the computer, the CPU is. the monitor is basically the screen, but this doesn't always apply to modern desktops, because certain monitors have built in CPUs.
Defective monitor, I have one that does the same thing, I opened it up, looked at the control board, one of the IC's is shorting the red analog line to ground. Was not able to fix.
CPU
monitor keyboard cpu harddrive rom motherboard cables processor
A Monitor is an output device, but a CPU is not
How Memory interface with CPU indicate the direction of signal and control signals?
CPUs are the most reliable piece of hardware in a PC. They rarely fail. If there appears to be a problem with a CPU monitor, it is likely due to an error in installing the CPU monitor, such as plugging in the correct cables. One should ensure that everything else in the computer is running correctly before concerning with the CPU.