After replace the electric meter outside, the

The meter replacement shouldn't cause hard disk recognition problems. If it powers up, it should be recognised and need no drivers, since it's a standard USB block device, supported natively by XP and later, Mac OS and most Linux distributions.

Why did they had to replace the meter? If anything odd happened to the electrics, it may well be that the MyBook got its electronics damaged. In that case you won't be able to access your data directly: you'll have to extract the hard disk from its plastic enclosure, and place it into another, intact USB enclosure (any enclosure will do, basically. Only verify whether it's a EIDE disk - four big power pins, 2-3 inch rectangular data slot with lots of pins - or SATA - two small slots vaguely L-shaped, about 1 inch wide - and get the appropriate type of enclosure).