when p2cabel disconected computerpowers up when conected not

December 12, 2014 at 08:55:35
Specs: Windows 7
when you turn on fans start then stop then nothing pull p2 cable out all fans start all lights up

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December 12, 2014 at 10:21:13
Your post is rather confusing... Can you explain in more detail - please.

Is this a laptop or desktop/tower system?

If a laptop are you running on mains power or battery at the time?

What is the cable to which you refer?

When the cable is removed does the system boot up and run OK thereafter?

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December 12, 2014 at 15:12:53
Got a feeling roys means a PSU cable, although confirmation would be very helpful. If my guess is right then try the paper clip test on the PSU:

This will give some confidence about whether the PSU is functioning or not.

If that works there are many other possibilities ranging from poor connections to motherboard failure.

Keep us posted with the detail and we'll try to help.

Always pop back and let us know the outcome - thanks

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December 12, 2014 at 17:39:28
OP may be referring to the 4 pin motherboard CPU connector which I believe began when the Pentium 4 was new and I have seen it referred to as the P4 connector.
If the fans are running but the machine does not start, it does not mean very much and it will not start without the CPU connector inserted.
Please supply all answers.
Is this a desktop?
Is this a new build or an existing machine?
Was there any problem that caused you to remove a connector as a test?
Has this machine ever worked correctly?
Exactly what connector?
Was there any new hardware or software added if it is an existing machine that was working?
Describe the problem from start to finish and include all you have tried and why.
List make and model if manufactured system or list all components if it is a custom machine or new build.

You have to be a little bit crazy to keep you from going insane.

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December 13, 2014 at 02:43:00
Derek - That paper-clip test is a gem.. Shades of Blue Peter (for the benefit of those outside BBC land, that was a BBC children's programme from days of yore) and a little of Apollo 13 resourcefullness for added flavour.

How did the chap/chapess work that out; and how did you find it?

message edited by trvlr

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December 13, 2014 at 07:52:35

Oh, it's widely known, probably just something that has slipped past you - same sort of thing has happened to me many times. For example, you can spend years doing something a long winded way only to suddenly find some easy peasy alternative that has been around since Win 95 yet has somehow deluded you. You feel like banging your head against the wall when that happens.

As for the paper clip, its usefulness is that a PSU has to loop through a mobo before even its internal fan can run - something that catches folk out the first time they run into it, rushing to get a replacement only to find they don't need it. The paper clip creates the loop and if all is well the fan will then run, giving you at least the confidence that something good is happening. To be more sure you get your multi-meter out and at least check voltages to make sure they look about right. Even then the voltages could fall on-load but fortunately that is fairly rare. Maybe a hardware specialist will come along and tidy up my words but I think the gist is about right.

Always pop back and let us know the outcome - thanks

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December 13, 2014 at 09:44:23

Tak for the info.

I presumed the paper clip created a form of loop through or a required connection for the psu to function if not installed into a system.

I agree re' the off-load volts quite possible "appearing to be OK" when they may not be when "on load".

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December 13, 2014 at 12:22:37

Re the offload. It is just the same with ordinary bulbs and batteries. Sometimes you can't even get a bulb to light but the off-load voltage is quite near 1.5V. Put the bulb across the battery and the voltage down to near zero. Ohms law really, a dud battery has a high internal impedance.

Liked Blue Peter bit earlier.

Always pop back and let us know the outcome - thanks

message edited by Derek

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