The Opus 150 had a common issue where the top plate was touching a part of the internals which would cause a seemingly similar issue. I know nothing about the 120, but it's worth a check to see if it's a similar problem.
does anybody body know how to fix a faulty 120 watts Opus power Supply.
cause my 120wtts Opus power Supply will not only turn on my PC if I keep on Playing with the wires by tapping it to the battery like 3,4,5 times and when I shutt down the car I have to try the same porcess again, sometimes it doesn't work at all but the LED on the PSU is laways blinking.
97 BMW 318I no head unit radio, Using 7" Llliput LCD
the 120wtts Opus comes with no plate(cover)