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Hi, i got a hp compaq mx7400, i dont hame the charger so i want to open the laptop and connect direct a different adapter to the chargig block. i dont know which pin is positive and negative

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You are in a pay zone ?There are ways, but if you are not a trained TEC for this It could cost you more than it would for a charger? I wouldn't advise anyone to chance grounding this part.This is something everyone says so and so does it? Do you think they will cry, with you when you ruin the harddrive?
There are so many things you can mess up with this act of pennywise, pound foolish.How much do you want for the PC before you fix it? There are other manufacturers; that make the same connection for their PC's.Some of them have universal connections? I know of at least two other people that thought
This is easy? Right before they purchased a new harddrive?I won't tell you their names, but I can tell
you what size their harddrives are?I would not tell you, this to buy your machine?Although a bargain
is a bargain.Sometimes you can buy you a charger used ,out of your local paper.Good luck !

Posted on Jan 10, 2009

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Step 1:
Try removing the battery from the back and then running it directly through the AC adapter. Sometimes the battery and AC adapter have conflicts and it can cause a laptop to become inoperable.

If this doesn't fix the problem in any way, I would recommend trying a new battery or AC adapter.
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Hi,
You can get all the drivers you need from HP support here >>>>>




http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=uk&prodNameId=97128&prodTypeId=12454&prodSeriesId=316510&swLang=13&taskId=135&swEnvOID=1093



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