Question about ViewSonic VA721 17" LCD Monitor

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Supply not coming

Power supply not coming

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1 Answer

Steady green light in the back--have reset the memory cards and checked all connections. I took cover off plugged power in and the green light comes on steady once again but th e fan doestn run and the...


replace your power supply you have lost your 12 volt supply coming from your power supply
but you have your other power supply voltages still working

Sep 30, 2013 | HP Computers & Internet

1 Answer

No power even if I plug my DVD to power source


Good day.

Follow this procedure for trouble shooting.

  1. Remove the cover of your DVD player.Loosening all screw.
  2. Check the input voltage of the power supply 220v/120v AC.If don't have input supply that comes from the ac cord,replace it.
  3. If you have a input voltage supply comes from the power cord.Check the output voltage of the power supply such as 5vdc and 12vdc.
  4. If the you don't have output voltage from the power supply.Check the fuse if busted,check open/change value of capacitor,check power transistor (regulator)if shorted and leak/bulging top capacitor of the power supply board.If you found any defective parts replace it.
  5. If you have output voltage comes from the power supply.The problem could be the main board,replace it.
  6. If you already done this procedure,test it by power ON the DVD player.

I hope this information will be helpful.Thank you and good luck.

Apr 17, 2011 | LG Televison & Video

1 Answer

Not working or coming on


Check to make sure the power cord you are using is getting 120 volts and that it is plugged in properly to the pc. If you are sure your power cord is powering to 120 volts, plug it in to the computer and see if the power supply light (in the back of the computer) is coming on. If it is, then the power supply is good, if not, you need a new power supply unit. If your power supply does not have a power light on it, listen for the cooling fans to come on when you press the power button, if they don't, it is very possible that the power supply is bad and will need to be changed.

Feb 10, 2011 | Computers & Internet

2 Answers

Computer wont turn on after power surge


You can try to change the sockets to which it was connected, try to plug the power cord of PC to different socket on surge protector or try connecting it directly to wall jack..


Jun 19, 2010 | HP Pavilion a1440n PC Desktop

1 Answer

My desktop dont come on


1) Check THE receptacle in the surge protector the computer is plugged into.

I have found more than once that One bad receptacle in the surge protector is bad.

"Hmmm, surge protector power on light is lit." "Monitor has power, amp for the speakers has power, and the router has power."
All plugged in to the same surge protector.

Tried a table lamp into the receptacle the computer was plugged into, Nothing.
Replace surge protector.

2) Bypass the Soft Power On of the Power Supply, and see if the problem is the Power On switch, or the Power Supply.

If you bypass the Soft Power On of the Power Supply, and the Power Supply comes on, the problem is a bad Power On switch.

If you bypass the Soft Power On of the Power Supply, and the Power Supply does Not come on, the problem is the Power Supply.

If you wish to know how to perform this simple test, just state so in a Comment.
(Believe upper right of your page)

Jun 17, 2010 | E-Machines eMachines Desktop PC

1 Answer

The power supply light on the board comes on but when i hit power button cpu fan comes on for a second and doesnt come on


The first thing I would suspect here is the power supply itself.
Unless you have a power supply tester, thought, it's rather difficult to test it. I usually replace the power supply in situations like this and all is well.

Jan 11, 2010 | Dell Dimension 4600 PC Desktop

1 Answer

Fans do not come on when plug power cord in


You can get the fan from any other power supply. Try a computer repair shop.

Please don't forget to rate if the answer helps

Oct 14, 2009 | Alienware PC Systems Alienware True 420...

2 Answers

42" Vizio Power supply board output voltage?


The next thing I would check out is the power supply for the screen. Most manufactures call it a Backlight Inverter Board. If a part does go bad on this board, it would also cause the stand by mode or protection mode.

Jul 30, 2009 | Vizio L32 32 in. LCD HDTV

1 Answer

My tower will not turn on I don't know what could be wrong with it under the power supply it's red. I only had it for a few month's and I tried everything.


does the power supply come on? theres a little switch on the back of the power supply it says 110 or 220. make sure its on 110. Also the red is coming from a light on the power supply or on the boards below the powersupply?

Apr 15, 2009 | Computers & Internet

1 Answer

Computer doesn't come on.


Easy check is: power the system off. Unplug the power supply from the outlet. Hold the power on button in for at least 10 seconds. Remove the CMOS battery. Reconnect the power supply to power. Attempt to power up. See what happens. If it comes up and asks for you to set config, power down, unplug the power supply and hold the power on button for 10 secs. Replace the CMOS battery with a new one (CR2032 button battery...about $5 for 2 in the Wal-Mart photo dept) and power on. The reason for the repetition is to reset the BIOS.

Sep 08, 2008 | Dell Dimension 4400 Power Supply ** FREE...

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