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[ron]

head unit is not loose display only shows bose sign nothing else wont move show anything else

[Marks DTM Calib]

So, the front panel (facia, not radio) sits nice and snug with the surrounding facia in the car.....

[ron]

yes that is correct nice and snug

[feeutfo]

from memory, when off and black and red bose logo is displayed, on mine only the on off volume knob is lit, this knob has been problematic on mine, sometimes does not respond when pressed. I prolonged press is required. But if the on off knob is not lit, as you say, and the fuse under stearing wheel is ok, then only thing left is supply/fuse to the back of the unit. If thats ok, only really leaves the unit itself as said, imho.

[Dave DND]

Assuming both lives are present at the back of the radio (measured with a meter and not guessed because the fuse is ok)

Check for dry joints on the back of the on/off switch, very common failure of the double din vauxhall head range unit due to the pressure of thumping the switch being greater than the amount of solder on the back of them. Care needs to be taken if stripping them down, but as most people inadvertantly rip the fascia off by incorrect forced removal of these units anyway, it`s always worth checking the switch joints as a preventative measure anyway.