I had a 1.5 PSP which I upgraded to run 3.40OE-A.
I went back to 1.5 but it failed 1/2 way through, and now :-
When I turn on from cold the orange psp memory light (left hand side) flashes for a bit - the disc spins for a bit but nothing happens on the screen. It then all goes quiet and nothing happens - need to remove battery to turn off.
I've tried formatting a new memory stick and downloading downgrade files etc but all to no avail.
Getting concerned now and would really appreciate any good ideas as I searched all the threads !