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Sounds like you have a short in the power connector on that HD. I'd pobably replace the drive.
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I have allready changed the hdd twice with known working ones. Ang tried different power concectors in fact a whole different power supply. Could it be the mb having a problem with hdd's and not cd/dvd drives.
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Is the HDD touching the motherboard? Move it. Try it with everything out of the case - motherboard on a piece of cardboard. Be certain the IDE cable is the right way around. Usually the mobo connector is a different color and the drive connectors are closer together toward the other end.<br />
<br />
Chris B
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Tried 3 hdd's checked cables, again and treid while they where on cardboard which i suspened above anything to do with the pc. All that was connecting the hdd to the pc was yhe ide cable. No luck, but as i said before the cd/dvd drive on the same ide port works fine.
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If you connect the hard disk to the computer with ONLY the power cable and have the IDE cable disconnected what happens?<br />
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If it works like that - can boot OK and not shut down - then it's like the IDE cable is shorting the power to the motherboard. &nbsp;In that case I'd try another IDE cable and see if the problem still occurs.
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Fine with ide cable just the power cable connected to a hdd makes it fail
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Try another power supply.<br />
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I'm suspecting that there's a fault there.
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That was my first port of call. I think burrcm seems to have the best answer at the mo. Cant see any probs with the mb. but that does seem to be the weakest link here.
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&gt;&gt; That was my first port of call.<br />
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Yep. &nbsp;Just read the original post again.<br />
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Hmmm. &nbsp;You've got a second power supply. &nbsp;Could you hook the second power supply up to the hard drive only and leave the first one to power the computer up?
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Hi there,<br />
<br />
I would start by replacing the motherboard and then checking to see if the problem persists. <br />
It is not uncommon to get a faulty motherboard out of the box, normally retailers are aware of this and should swap it out no problem.<br />
That is the only common factor here that I can see.<br />
<br />
-FB<br />
<br />

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Tried a two power supplys no luck. It has to be the mb. PC to old to bother with. Im taking my data and washing that PC right out of my hair. Thanks to all comments. burrcm you get the points. Has to be the MB and you where the first to say so. Thanks Paul Angell from London.
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Pc trys to boot, fan comes on for about 2 secs then all stops. Changed power supply dissconected eveything one piece at a time. Finaly found when i disconected the power from the hdd (NOT THE IDE CABLE) the computer started allbiet just to the boot screen as there was no hdd connected. Tried a different hdd no luck, tried swithching to ide 1 from ide 0 on the mb, no luck. so i tried diffrent ide leads no luck, then i thought i would relace the hdd with a cd/dvd drive and guess what booted into the post screen. Put the hdd back on and back to the problem again, ie pc tries to boot up but powers down after 2secs. Am i missing somthing here. Thanks to all &nbsp;who take an intrest in this post Paul Angell from London UK.
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Pc trys to boot, fan comes on for about 2 secs then all stops. Changed power supply dissconected eveything one piece at a time. Finaly found when i disconected the power from the hdd (NOT THE IDE CABLE) the computer started allbiet just to the boot screen as there was no hdd connected. Tried a different hdd no luck, tried swithching to ide 1 from ide 0 on the mb, no luck. so i tried diffrent ide leads no luck, then i thought i would relace the hdd with a cd/dvd drive and guess what booted into the post screen. Put the hdd back on and back to the problem again, ie pc tries to boot up but powers down after 2secs. Am i missing somthing here. Thanks to all  who take an intrest in this post Paul Angell from London UK.

Weird ide problem

A personal computer is a general-purpose computer whose size, capabilities and price make it useful for individuals, and is intended to be operated directly by an end-user with no intervening computer time-sharing models that allowed systems to be used by many people, usually at the same time. Personal computers may be connected to a local area network (LAN), either by a cable or a wireless connection, and through that to the Internet. A personal computer may be a laptop computer or a desktop computer running an operating system such as Windows, Linux or Macintosh OS.