Wont power on. When I plug the power cord into the wall the green led on the power pack is bright. When I then connect it to the back of the monitor, the green led goes dim and the transformer makes a humming sound.

Here's some tricks I would try...
1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or orange or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.
7. Also, you could try your display on a friend's computer. If it doesn't work, your monitor probably needs replaced. If it works properly on your friends computer, the problem may be with your computers video output port, motherboard video chip (or video card, if you have one), or drivers.
Good luck.

Pay attention to steps 6 & 7

Here's some tricks I would try...
1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or orange or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.
7. Also, you could try your display on a friend's computer. If it doesn't work, your monitor probably needs replaced. If it works properly on your friends computer, the problem may be with your computers video output port, motherboard video chip (or video card, if you have one), or drivers.

1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or flashing, but nothing displays, borrow a monitor from a friend. If that works, your monitor needs replaced.

1. Verify the monitor's power cord is plugged firmly into the wall outlet and the back of the monitor.
2. Verify the monitor cable is firmly connected to the computer and the monitor.
3. Verify that you have turned the monitor power switch on.
4. If the power light on the monitor is not on, test the wall outlet (plug in a light or something you know works).
5. If the power light on the monitor is not on, try a different power cord.
6. If the power light is on and yellow or flashing, but nothing displays, or the display is incorrect, borrow a monitor from a friend. If that works, your monitor probably needs replaced.

Check the pins in the end of the monitor cable, look for bent ones. If it's okay re connect to the monitor and try again. Unplug the monitor and wait for a few seconds, plug power back in. Cycle power on the monitor. Then restart your computer. Wiggle the monitor cable on either end and see if the color changes.Good luck

It is possible that your monitor is on a GFI switch. These switches turn off if they detect a problem that could incur a shock, or if they are getting worn. Check if there is a power outlet in the same room with a red and black switch. If so, push the reset switch, typically the red one.

Your monitor may also be on a switch activated outlet. Is it plugged into the top outlet? See if a wall switch nearby controls the outlet. then try turning on your monitor.

Is the surge protector your monitor is plugged into turned on?

Check the cord on the back of your monitor. It is possible it may be loose. Plug it in all the way.

Some Viewsonic monitors have a power pack that is not inside the monitor case. Check the wiring between it and the wall and between the pack and the monitor for frays.

Hi. this is a failed power supply. the power supply pack will have to be replaced. it located on the rear side of the tower in the upper corner. its where the power cord plugs into. replace the power pack and this will fix the issue at hand.

It seems to me the LCD cable is either not properly unplugged or LCD ha gone bad.
Connect external monitor to the laptop and check if you have the Video on the external monior. If everything looks fine on external monitor then you can get the LCD replaced.
In case system does not power up and there are no indications of power.
Here are the steps:
Connect only the AC Adapter and take the battery out.
Check if you have a green led lit on the AC Adapter.
If AC Adapter does not has a green led please replace it with a known good AC Adapter.
If the AC Adapter has a green led but still no power it can be the system board which has gone bad.

It should work OK once you plug it back in. Note there are three places to check the power connection.
- The power pack has to be inserted firmly
- the cord that goes into the power pack
- the cord into the wall - be sure to check the wall outlet with a lamp or something to make sure it's not an overall power problem/breaker, etc.

Steve

There is a whole lot the typical user can check but here is the list: -Disconnect the power plug from the power strip and plug directly into a tested wall socket. Sometimes the power strip sockets go bad. -Try another working power cord. -When you plug in the power cord do any of the monitor LEDs com on?