@Zing Thank you for your response. I've never changed the theme, and therefore it should be the default theme. But I'm trying out ARRM now.
Thanks for answering, but I think that it is not a Recalbox problem because when i plug a mobile charger as a power supply to my raspi it boots normally. Furthermore, this boot screen appears if I try to boot NOOBS too.
Juste remove all overclock settings, it's hardly worth on pi3
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problem is solved! i was using before ane noname SNES controller from ebay for 6 bucks. i have replaced them with an ibuffalo SNES controller and its working fine now !!!!