toshiba external hard rive makes bbeping soung when plugged to power. it is also not recognisable to my laptop. i have tried changing ports but of no help. please help
May be it is not enough power to spin the drive, especially on laptop running on battery. Did you try USB Y-cable?
If this doesn't help - you are in trouble. If your data has value you need help from data recovery company, like www.datarecovery.net