Transformer in buffalo hd-lbu2 external hard drive working but no power in the unit

What does the manufacturer's information say a code 127 is? We need to know that to give you any help. What did they try to fix already?

Hmm, go to Start, Control Panel, Administrative Tools, Disk Management. Then look or scroll down right hand panel to find your disk. If it is there you could RIGHT click on it and assign a new drive letter such as Q or R.
If it's not there your external disk could be faulty, the power supply transformer or power cable could be faulty or it could be the USB cable.
If all looks OK you probably need to contact a disk recovery specialist such as DATA365.

Comment: NTFS is a much more stable file system and is much easier to recover after errors. FAT32 is not commonly used now.

Well that is a pickle. If there is no warranty left on it you can allways try to open it up a bit and check with a geiger if the juice is running through it.By Geiger i mean a voltmeter
.http://www.youtube.com/watch?v=T1BT5kw6sqY that should help a bit and if the connections are good you might wanna get yourself one of theese
http://www.amazon.co.uk/Buffalo-HD-LBU2-External-replacement-adaptor/dp/B007FI1PH2

Try a drive dock on the Removed Hard drive. The usual problem is the enclosure.

Return the hard drive to the place of purchase, this is a manufacture defect.

try to test it on other computer or laptop... if the unit are still exist maybe your problem would be the external drive..there are no switch button on it, because most of the switches are located on the adapter, the only testing you could do is to test it to other unit..If the external drive are ok once after you test from other PC's, then might as well check your USB port by plugging-in to other port...or try to use other power supply on your computer, co'z sometimes the supply can no longer supplied any voltage coming from your external drive once it plug-in..

if it does nothing when it is turned on i would return it.

set your bios to boot from your normal drive, not the ide buffalo drive ...

Check the usb port function in the computer bios settings and be sure that it is set to yes. Connect properly your external drive. If it has two wire usb connections, use both to obtain the maximum power that will be need by your drive.

Is the power supply internal or external? If external, then just find a similiar or identical unit. If internal, then you could try removing the hard drive and installing it temporarily in a desktop system. Obviously, interfaces must match (SATA, IDE). You could then see if it is accessible, and get any files.