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Most external hard disks use a 12 volt 2 amp power supply. The modern ones are small and cheap. Be aware the power plug should be the same as the power plug on the old power supply. and the polarity also.
Would be great if the next time you also place the model number, because Cavalry makes dozens of different drives.
When the bleu light does not go on, you have to assume the drive is not getting power.
If the drive has only one cable, (small drives like 2,5 inch most of the time only have one cable) it could be the USB cable is defect and can't give through the 5 Volt coming from the computer USB connector. It also could be the 5 Volt supposed to be in the computer has gone.
If you have to connect an external power supply, with a small cable to the drive, I would check the power supply. A 5 Volt 2 A supply, with the round plug can't be that expensive.
If both don't work, it also could be inside the housing of the drive is something defect.
If you need to have the data on the drive, you always could but an universal USB connection for hard drives. I have one for IDE and E-SATA, in the box came a set power cables and a power supply, but that one was almost 50 dollar. There are cheaper ones on the net.
Be aware drives don't live forever and make sure you always have at least two backups. (that is more than one origin; and one back up)
The hard drive needs a proper regulated power adapter for the hard drive to work. If the hard drive is a 5.25 inch drive it requires 12 volts and 5 volts power supply. If the hard drive is a 3.5 inch drive it requires a 5 volt power supply.
***Please NOTE*** Touch the drive and put your ear to it, to test if the drive is spinning and working. Do this while it is powered on. Also, try disconnecting the USB cable, reboot the computer, re-connect USB cable to another USB port on computer. If you still have the same issue, try the below solutions.
Make sure the computer and external hard drive are powered on.
Disconnect the external drive's USB or the eSATA cable, which ever one you're using.
Disconnect the power supply plug from the external drive.
Power off the computer.
Disconnect the computer's power supply cord for 60 seconds.
Reconnect the computer.
Power on the computer.
Connect the power supply to the external drive.
Connect the drive's USB or the eSATA cable and check for detection.
If the still no detection and still blinking lights on the drive, check the power supply to the drive. Check to see what the led light on the power supply is doing. If it's blinking, power down the drive, unplug data cable and then reconnect the power supply to another electrical outlet. If it still blinks repeatedly, then you power supply is bad. If the led is solid (lit and not blinking) follow the same steps from above to connect it to another outlet. Next, plug the power supply to the external drive and power it up. If the power supply starts to blink repeatedly, then your controller board inside the enclosure is bad.
Working previously is good. Ok, a quick list of the things i have done wrong in just this circumstance.
Is the power supply plugged in and switched on? Is it supplying power? Is it supplying the correct voltage? *Note: You will need a multimeter to do this. 12 Volts is the correct voltage. Is the power supply plugged into the drive? All the way? Is there a power switch on the drive? Is it in the on position? Is the data connection plugged in? All the way? The computer end also? All the way? Does the cable run from the computer to the drive, or are there other cables lying around two of which are plugged in at one end? Are you using the same data cable you did before? Does it work with different cable? *A caution here. Not all cables are equal. You want to use a USB 2.0 cable.
If it was working before, any one of those could be the problem. I've had them all.
First thing you need to do is to confirm your Power supply is working, i think its a 12 volt adaptor so check wattage rating and then try to power a router or a device that uses the same voltage and wattage with it, an easier way is to check whether the light blinks once very fast right when you stick the adaptor into the external HD's back, if it does, download hyrens Boot CD from thepiratebay.org and burn it to CD...Most of the tools on Hyrens boot CD work in DOS but a limited amount works in windows, try booting into windows and try using the partition recovery tools like undelete etc, if this does not work you will have to take the actual HD out from the case by dissassembling it and then plug the actual HD without the case straight into your pc via sata cable, restart your pc and instead of booting windows boot the hyrens boot CD Menu, now use the partition and HD checking tools, this should work, if it does not, your HD is irreparably damaged and you might need to mail it to data recovery experts to get your original data back, Hope this helps..
Unfortunately the guys at the shop are right. Any viable solution will invalidate the warranty except try a new power adapter. The problem is you can't just buy a new power adapter for this device.
If someone you know has the same device(compare Volts and Amps on the power supply) you can test the theory, but would still need to find an adapter to buy somewhere like ebay.
My suggestion, which will also void the warranty, is to simply purchase a new empty enclusure and have the techs move the HDD from the My Book into it. Assuming the problem is in the shell or power adapter this will solve your problems. If this doesn't work, then you know the problem is in the HDD itself and you will definitetly need the help of a data recovery pro.
Feel free to comment back here with you City name and I can recommend a nearby facility if you do need a pro.