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Power supply works but when you plug it in the computer does not recognise that the plug is plugged in

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I have a Monorail PC #4200. The monitor screen is black with a blue "override" in the middle. The tower is in standby mode (I think) as a green and a yellow light is on. The monitor will not recognize any mouse I plug in. What can I do to get this thing working?

Posted on Dec 05, 2008

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Do you mean what power supply to install inside of the computer? There is no power supply that plugs into the back of a desktop computer. If you are talking about what power plug goes into the back, Then any pc 3 slot female plug should work. The link below should give you an idea. If the link doesn't show, Then search for "computer power cords"

http://www.newegg.com/Computer-Power-Cords/SubCategory/ID-2827

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My Gateway DX 4300-05 won't start. Not even the power supply. Does the motherboard have a reset?


If I am reading the frist part of your stament correctly, the power supply does not even kick on when you press the power button. Don not unplug anything from the inside of the computer at this time, instead check your power cord and make sure it is plugged in thightly to both the computer and power strip. Check to make sure the power strip is on, plug something else (like a light) and test the power strip. If the item does not come on, then you may have a bad power strip. To confirm plug the item you are testing with into the outlet the power strip is plugged in to and see if it works. If not your outlet may be bad, contact an electrician. If everything works, but the power supply is still not kicking on, you possibly have a bad power supply. You will need to pick up a replacement power supply and install it in the computer. This is were you unplug everything wire bundle that comes from the power supply to the mother board (paying attention to what was plugged in where). Take the new power supply, install it, plug everything back in. Now try the power button. If this fails then yes you have a bad mother board.

I know most computer retailers that offer repairs, have a device to check the power supply. A good repair place will check this at little or no cost to you, if you agree to let them install the replacement if it is bad (they will charge you for the power supply and installation of it).

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I accidentally plugged computer avr 220v to 110 could it affect my power supply


If the computer power supply is a 240 volt unit and you plugged into 110 volt mains the the computer should be OK.
Some power supplies have a voltage selection switch on the back of the power supply switch to 110 volts and it should work.
If the power supply is 110 volts and you plug it into a 240 volts mains then you will damage the power supply and possibly the computer as well.

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Its telling you to get a new power supply.

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Make sure your plug has power. I just plug in a lamp and turn it on.

make sure the power supply is set to the right voltage. it should be set to 120 v and can be found on the back of the computer where you plug in the power.

Also, tthere is an on off switch for you to check back there.

if non of this works you should open the case and check all cables from your power supply to mak sure they are plugged in.

The last thing would be to replace your power supply.

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Computer does not turn on


Check the switch of the power supply at the back (black button) First
If the power supply fan doesn't work or cpu fan doesn't work
Replace the power supply.

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if you have a waranty use it if not check to see that the power supply in the back of the computer is working if not check to see that the plug in in the wall has power plug in a fan or somthing into it if it has power but the power supply still does not work you might have a bad power supply try to unplug the power cord from the computer and press the power switch for the computer and look to see if a light blinks then wait a few minutes and plug in the power cord back into the computer and try to powewr up the computer and see what happnes if nothing sorry to say but you need a new power supply please let me know ok i can help you more best regards mike

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Your hard drive is not being recognised by the motherboard. Try this...
  1. Unplug your computer from the power supply.
  2. Remove the side cover on the case.
  3. Unplug the 2 cables from your hard drive. (it will be at the front of the case and look like a block of metal with 2 cables going into it)
  4. The plugs will only go back in one way, so be sure you have them the right way around before trying to reconnect them The power plug has 2 tapered edges on the top and the IDE cable (the thick one) has a notch. Both will match up to the hard drive. On some older driver/IDE cables there is no notch. In this case, the red wire will be closes to the power plug.
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