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My explanation is awful. :oops: Maybe, somebody else can do it better?

Hm... As I learned at school, genitive case answers questions "кого?" or "чего?". You can ask "Нет чего?" and answer "Видеокассет". Nominative answers questions "кто?" or "что?". You can't ask "Нет...

Genitive.


Видеокассета -- singular
Видеокассеты -- plural

Correct.


Incorrect. It must be either as in first sentence (plural) or "У неё нет русской видеокассеты". (singlular)