Before turning the 801W on, I press the on-off button briefly to see if the screen lights meaning that it is already on. To start the unit, I press and hold the on-off button for a count of six. Pressing and holding the power button when the unit is already on can cause problems.
Sometimes the 801W has a "quirk" where it refuses to come on or stays on when you want it to shut down. This is usually caused by pressing the on-off button carelessly. This is fixed by FIRST completely discharging the battery, then recharging for at least an hour. Take the computer to a completely dark room and check for a dim screen glow. In this case, the battery will discharge itself in several hours. In some cases, the display will light for a few seconds then go off. When it does, try briefly pressing the power button to see if the display comes back on. If so, repeatedly cycling the power for a while will discharge the battery.