I connected my laptop power cable to my external hard drive and now there is no power to the hard drive. My question is did i ruin it or can I take it out of its case and install it in to a computer?
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You may have damaged the extenal drive when you used the wrong power adapter, That is a common problem wrong type of current, wrong polarity or wrong voltage. Mostly bad labeling you can’t tell which adapter goes with what device. Frequently the manufacturer of the adapter is different from the device.
You most likely fried the HD. Laptop power supply is putting out more volts DC than an external HD and I doubt you can fix it yourself. Someone may be able to or at least obtain the data off the HD if you absolutely have to have it.
For future reference – Label both the power adapter and device with a model number and voltage and current rating so that they be matched if separated or need to be replaced.