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I just got my Raspberry disconnected from a 1 meter USB cable and then connect an extension USB cable (about 2 meters). Before replacing the cable the Raspberry functioned normally, but after replacing the cable, the green LED flashes and nothing happens. I tried 2 chargers: one 1A and through the gate with a second outlet with Raspberry 2A but this does not have any effect.

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  • Does it work when connected to a short cable? If so the long cables are probably losing too much voltage.
    – joan
    Jul 30 '15 at 9:13
  • Yes! with short cable it work perfectly.. I wondered over low voltage but do not know how to check .. I have a strain gauge, but I do not know how to measure voltage usb Jul 30 '15 at 9:16
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    Well, by experiment you have discovered the long cables lose too much voltage. Buy chunkier cables, USB cable wires can be very thin.
    – joan
    Jul 30 '15 at 9:41
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If you want to check the current draw over USB, then there are many types of USB voltmeter/ammeters available on eBay, for example:

USB Voltmeter

This may help you track down the problem. However, as joan suggests in the comments, if you must use a 2 meter cable then get a thicker USB cable, so that there is less power drop.

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I think you have pretty much done the troubleshooting yourself, the problem is most likely in the cable. It could be a really low quality one, since moving from 1A to 2A doesn't change a thing. Maybe the cable is even broken.

You could try and see of the extension cable works with connecting i.e. your phone to a PC (if it's that kind of cable).

The longer the cable the less efficient it will be, so might as well go for a proper one in your case!

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Sorry for late reply,

Problem was not resolved,but it was in cable. I have found better cable and everything is now okay.

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