toshiba rdxv60kb vcr/ dvd/ hdd recorder?

Looking for some help to fix my Toshiba combo recorder, had a scheduled power cut for line work, when I tried to turn the unit back on it would not power up at all, checked the plug and internal fuse and both ok, I read on a few forums that the diode could go faulty but I cannot seem to find which one it is and wondered has anyone had this issue and knows which part to replace, that would be much appreciated