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Just received Refurbished Advent CBE 1401. It is being replaced because power switch is faulty - but I have questions about machine. 1. When initially switched on the switch turned red is this normal? I could not switch computer off with switch. 2.There was no signal being received by monitor which I had plugged into monitor socket. (There was an adapor included for one of the other sockets -but I didn't get chance to try it as after I had attempted to reboot computer it refused to switch on at all) I am using an LCD monitor - SyncMaster 710N. 3. What is the switch beside the power unit on the back for? 4.How much space needs to be left between side of computer with fan.

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1) No. The switch color should have been Green

2) No Signal on the monitor, indicates the monitor is not receiving a Video Signal from the computer.

A) Could be due to a faulty monitor cable.
Monitor cable is used on a working computer for a test,
working computer's monitor cable is used on the Advent for a test.

B) Could be due to the graphics 'engine' on the motherboard, or on the graphics card is bad.

[Graphics 'engine'.
Graphics Processing Unit. ]

If the computer is using Integrated Graphics, the GPU is on the motherboard.

(Integrated Graphics is also referred to as OnBoard Graphics. Meaning On the motherBoard)

You will know if it's Integrated Graphics, because the monitor cable will be plugged into the VGA connector, on the motherboard

Since you indicate an adapter was included, to adapt to a different port (Connector), it could be a VGA to DVI adapter, or a DVI to VGA adapter.

Your monitor may just have a VGA connector on the monitor cable.
Hence you would use a female VGA to Male DVI adapter.

Your monitor may be an LCD flat screen monitor, and has a DVI connector on the monitor cable.
Hence you would use a female DVI to Male VGA adapter.

Digital Visual Interface

VGA monitors are Analog.
LCD monitors are Digital.

A computer puts out a digital signal.

If a VGA monitor is used, the computer has to alter the Digital signal to an Analog one.
This slows down the video signal.

If your monitor (In any case. Not just this one), is an LCD flat screen monitor, it is best to use a DVI monitor cable, and plug into a DVI port on the computer, if available.

If your monitor is a VGA (CRT. Cathode Ray Tube), monitor, and you have a DVI connection on your computer, using the adapter will do you no good.

The adapter just uses the contact pins for VGA, that are present in that DVI adapter, and hence the DVI connection on the computer.

You're still just getting an Analog VGA signal.

Example of a female VGA to male DVI adapter,

If the Integrated Graphics are suspected to be bad, a graphics card is used in the appropriate expansion slot, for a test.

If the graphics work then, the graphics card is left in service.

After I test the monitor cable my next procedure is to suspect the Power On switch, or the Power Supply, and go to the graphics next.

The reasoning is that Power Supply failure, is the number one cause of computer failure.
The next is the Power On switch, then Electrolytic Capacitors used on the motherboard.

(Specifically, any Electrolytic Capacitors used in the motherboard Voltage Regulator Circuit)

If the Power On switch is bypassed, the diagnosis will reveal if the problem is the switch, or Power Supply.

Bypass the Power On switch, and the Power Supply comes on?
Problem is the Power On switch.

[One Power On switch I have found to fit a lot of computers. The Power On switch goes into the plastic Power On button, ]

Bypass the Power On switch, and the Power Supply does Not come on?
The problem is the Power Supply.

The Power On switch is bypassed using a jumper wire, from the green Soft Power On wire, to ANY black Ground wire. The contact made is a brief momentary one.

The jumper wire is used at the back, of the 20, or 24-pin ATX main power cable connector.

To be continued in an additional Comment.

Posted on Jun 05, 2010

  • joecoolvette
    joecoolvette Jun 05, 2010

    This is an example of a 20-pin ATX main power cable, and it's respective connector,

    An example of a 24-pin main power cable, and connector can be seen by scrolling down further.

    Apparently someone diagnosed your computer, and found the problem to be the Power on switch.

    If I may, You could replace the Power On switch yourself, and have a working computer again.
    As I stated above, the Power On switch is inserted into the plastic Power On button.

    The switch I linked may not fit that Advent Power On button.
    The switch I linked, could simply have the switch hanging out of where the Power On button was.

    (Wires from the switch, go through the hole where the Power On button was. Switch hangs outside the computer case)

    Granted, not a professional approach, and may not be considered aesthetically appealing.
    Would result in a working computer again, however.

    The voltage used at the Power On switch is 5 Volts. (DC)
    Two C cell batteries produce 3 Volts (DC)

    Just food for thought.

    3) The slide switch located on the back of the Power Supply, is used to set the Power Supply to use the Voltage in your country.

    You will see 110, and 220.

    The USA uses 120 volts.
    Most of Europe uses 220.
    Some countries use 100 Volts. (Japan for one example to my understanding)

    Your residence, or place of business, uses AC electricity.
    Alternating Current.

    A computer power supply converts the AC into DC.
    Direct Current.
    (A flashlight battery is one example of stored DC electricity)

    The computer Power Supply also provides the necessary Voltages required.
    A computer Power Supply produces three main Voltages.
    1) 3.3 Volts (DC)
    2) 5 Volts (DC)
    3) 12 Volts (DC)

    If you are located in a country that uses 220 Volts, and you have the Power Supply slide Voltage switch set to 110 Volts, and you plug the computer into power, once you press the Power On button you can kiss your Power Supply goodbye, and maybe all of the other hardware parts inside your computer.
    [Motherboard, Processor, Graphics Card if used, Harddrive, etc)

    4) The components inside a computer are cooled by air.

    I recommend at Least 3 inches of room all around the computer.
    Myself, the computer tower sits on top of my computer desk, to the right.

    There are no obstructions around it anywhere.
    I don't want it tucked down towards the floor in my computer desk, because it will draw all kinds of foreign material into the computer.

    Dust, dirt, animal hair, people hair, carpet deodorizer, food crumbs, (It is possible), and lint, just to name a few foreign to the computer, materials.

    I use a can of compressed air for computers regularly on a basis as needed.
    Lately it seems to be a weekly project.
    (It's summer)

    (Computer unplugged from power, computer case open, work on a table, observe anti-static precautions)

    Want to see a computer quit way before it's time, leave the inside of the computer dirty.
    (Desktop or laptop)

    I also want the computer to have free access to the needed air.

  • joecoolvette
    joecoolvette Jun 06, 2010

    Appreciate the rating jmelsdon, you are most kind!


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