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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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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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My WD external hard drive has suddenly stopped being recognised by my computer


Unplug the power supply from the hard drive, leave for 15 seconds.

Plug power supply back in.

Try another USB cable if that does not work.

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My Hard drive was working fine until I uplugged it, have just tried to plug it back in and now my laptop won't recognise the drive, it can't find it. help?


Does the drive have its own power supply or does it get power from the laptop? If it gets power from the laptop, does it have a plug for an external supply? If it does, try plugging in an external power supply. Sometime the laptops can not supply enough power.

If the drive is working at all, you should feel some vibration and hear the drive spin up. Can you tell if the drive is spinning up?

Jul 01, 2011 | Computers & Internet

1 Answer

Hp psc 1205 all-in-one The system has stopped working, i have checked wires are plugged in, changed the fuse etc but it doesn't seem to recognise any power input. Is it likely to be the lead from the...


Its just the issue with the Power supply.

You can check

1. Try some other wall outlet

2. You will see that there is a power supply of black color, the plug from wall outlet is coming to that box and then from there its going to the printer, so check whether the wires are plugged in well in the power supply.

If everything is well then we can try power drain

1. unplug the plug from the wall outlet, unplug the power cable from the back of the printer and if you can unplug the cable from the power supply do that too

2. Unplug the USB cable from the back

3. leave it for 3 to 5 minutes and then try again.

If that also did not help then, try to get some power supply from your neighbor or friend make sure its of PSC 1200 series and try that.

Jan 04, 2011 | HP PSC 1209 All-in-One InkJet Printer

1 Answer

I am having exactly the same problem


Its not recognising the power supply.Get the power supply checked in the laptop.

Jul 06, 2009 | Advent 4211c Notebook

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Flashing blue light on external WD hard drive & not recognised


sounds like you are using the wrong power supply. Check the amp output on the power plug you plug into the wall make sure its the same as the amp input of your external harddrive

Jun 01, 2009 | Western Digital My Book Essential 1TB...

1 Answer

Power supply not charging


Just a suggestion, There might be something wrong with your PSU and thats why your computer is telling you that the PSU is wrong. Go to a computer store and buy a universal power supply that fits your notebook. Ask someone there to let you test it before buying. and if it works without telling you that same error. then you have should just buy it and that tells you the other on is a fail PSU. But if it does tell you the same error. you might have something else fail on the motherboard.

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2300 router not sending signal or allowing flow to computer


First unplug router, turn off computer. Then plug ethernet into router then power up. Allow time for router to recognise internet connection and boot up completely. Then plug second ethernet into computer then power up computer. Allow enough time for the router to recognise computer and the computer to recognise router. You should be able to access internet within a few minutes. If not you might want to verify that the router is not outdated and fully functioning.

Oct 13, 2008 | Dell TrueMobile 2300 Wireless Router...

1 Answer

Im plugging my flash drive into the usb and nothing is coming up. this one works in other computers but not this one


For starters, what is the operating system of this computer?
Windows XP will recognise flash drives, 2000 seems to recognise some but if you have 95, 98 or Me you need to install a driver for the drive. The manufacturer of the drive may not even supply one.

Sep 28, 2008 | Computers & Internet

1 Answer

Computer won't recognise camera to download images


** Problem Solved **

I found it wasn't the camera entirely to blame. I tried another USB cable on another pc, and although the camera was doing the same thing as my problem, the computer recognised the camera as new hardware, and asked me how to access the pictures. So I was able to get the pictures from the camera to the computer, and then saved them on to my Kingston flash drive. So taking the flash drive to my daily PC, I plugged in my flash drive via a USB extension lead, and discovered that would read either... alarm bells rang. So I unplugged the lead, and put the flash drive straight into the computer direct. The computer recognised it immediately. So plugging in the extension lead again, and the flash drive, it read this now. So I tried the camera, and it recognised it.

So I don't know exactly what the problem was, but it was solved... saved me a lot of running around and money ;)

Feb 13, 2008 | Cameras

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