Hi Daschiba and others,
Unit appeared to be Toshiba PX1219E-1G16 160GB .
After the "Deafening Silence" of Support Toshiba Europe, decided to open unit as described by Daschiba.
Before that: Checked Power Supply, was O.K.; so my idea that USB interface was defect, was vindicating.
Not that simple, had to use "brute force", but (luckily) disk 100 percent O.K., no lost files; so "back-up still available.
Greetings, Nap - Gent - Belgium