Fix computer turns on but no display on monitor

Nothing is showing on the computer display after turning on my computer. The computer's LED lights are on. The cooling fans of the computer turn on. But the display of the monitor does not show anything. And my monitor is completely OK. Disconnect the power to the computer. Remove the cover on the left side of the CPU. Now remove the RAM from the computer motherboard. Now clean the computer's RAM with any eraser. After clearing the computer's RAM key, reinstall it on the motherboard. Then connect the monitor and the CPU's power. Now turn on the computer
No display on monitor but CPU running
My desktop computer turns on but the monitor screen stays black
Computer turns on but no display on monitor



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