Razer Abyssus V2

Maybe sensor is dead, button also doesn't work? If yes, I'd check the cable as it's most vulnerable to damage (you can try replacing it from other mouse, ofc if it have the same JST connector size).

Sorry to hear that your Abyssus V2 mouse died bro... sadly not much these days lasts forever unless you take very super good care of things anymore. Just be glad it was NOT the Original 2006 DeathAdder 1800 mouse that suddenly went kaput on you as that is a very rare mouse now! Trust me, IF I had one of those 2006 DeathAdder 1800 mice to this day and it suddenly went kaput on me I would cry so much cuz the Original 1800 DeathAdder model is pretty much nearly impossible to find now (due to the fact that so many counterfeits of it have been made in recent times sadly, I've seen my share of them around the web, makes you wanna throw up!). Abyssus V2 is somewhat old from what I know, so it was probably time for you to upgrade since the ergonomics designed for ambidextrious mice have came a long way since the Abyssus V2 was made and are much better now and they are also a lot more comfortable to use for hours on end in long gaming sessions. Some prime examples of that are the Razer Orochi V2, Viper Ultimate, Viper V2 Pro just to name a few (I know more exist from other companies but just mentioning these since they happen to be some of Razer's top models for most currently in the ambi-form department).