Pure Evoke 2xt DAB, not switch on after back removed?

Buy or borrow a voltmeter - check to see if the AC DC power adapter is producing an output.

If there is a DC output then you will have disturbed something inside the radio - the big hint is that it worked before you took the back off but did not work when you put the back on again - perhaps the action of putting it back together caused the problem you have - either that or you disturbed a connection without realising it.

Nobody here can see inside your radio...

Good Luck...
February 2017