If I lock my computer (or leave my computer for 5 minutes to lock automatically) and turn off my monitor when I come back after a long while I turn on my monitor and nothing will show up. My tower's power light is on so I know my computer is not off, yet even after moving my mouse around and the colour of the light on my tower and monitor changes from orange to white, nothing is displaying. The monitor does not say it's not connected, or the message that it is going into powersave mode (message given when my computer is off) so I know everything is working fine. I assume my computer has gone into sleep mode, or whatever this mode is called, but I have no clue how to get passed this except by holding down the power button on my tower and then turning it back on.
Any help is appreciated, thank you.