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Basically i connect the 20 pin of the power supply to my motherboard and it works, but doesnt turn on, and when i connect the extra 4 pin then it wont turn on at all whats the problem please?

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This isn't a general PC Desktop question; and without a videocard, why would your system boot? Indeed, most won't run more than 2 seconds if they don't get a good fan tach reading for CPU and perhaps other fans. You need to describe what's unique about your situation and give the mobo model if you want to fix something that's not already set out in the appropriate PC and motherboard manuals.

Posted on Aug 02, 2008

Your motherboard must have blown or seized. If it's new, return it and tell them to test it, they should replace it.

if it's old, try connecting it to a differant pc, but if worst comes to worse, take it to a pc technician.

Posted on Jul 31, 2008

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Is this a new mother board or a new power supply? Some machines work with no 4 pin power, does everything work such as the fan

Posted on Jul 31, 2008

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Make sure that you connected all of the required power connectors on to the motherboard. Depending on you motherboard, there might be a 4 pin connector next to the CPU that supplies extra power to the CPU. Also if you have a dedicated video card (not integrated to the motherboard), it may need more power as higher end video cards need direct power from the power supply. Also make sure you have your monitor connected correctly.
With that said, I have a feeling that it is the 4 pin CPU connector since it is easy to miss.

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Gee. If HP recomends you not to hook up the extra four pins it must be because the four either go nowhere,which may cause a short or ground condition.Or that the extra pins will power something that will then  be in excess andd cause it too burn out. They know what will happen and for that rwason caution you not to do it. Of course it is you machine and  if you have extra money to replace things with go ahead and do it if you really want to know that badly.

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I am assuming this is a desktop and not a laptop. On the power supply you have a number of connectors. A 24 pin connector (like a lego block) or a 20 pin (leg block) with a 4 pin (in the pattern shown on a dice) Look at your motherboard and check whether you have any connectors which match these and plug them in. They only go one way round as they are shaped. You will need to plug in the wide white 4 pin connectors to everything else like your CD, your hard drives. The floppy drive has a separate smaller white connector. If you have a sata drive these are usually black and flat. Basically you need to connect some wires to your motherboard and one power cable to each of your devices, hard drive, CD/DVD, floppy drive. It doesnt matter which one you choose. Just one that will fit. If you have a souped up graphics card there may be a 6 pin connector for that either on the board itself or on the graphics card. The 6 pattern is the same as a 6 on a dice also.
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