Just got a N64 for $1.
1. Is it normal if it shows no signal without a game inside.
2. What is supposed to be in the "memory expansion" slot? I see a black cart thing. How do I pull it out?
3. Should I get an Everdrive 64 V2? And where can I get one cheap?
Most of this is allready answered, but i'll give some extra information
1. On all of the N64 I had, they didn't show anything without a game inside. So this should be normal. Some models may show a memorycard manager when booting with no cart, but I never came across one, so can't say. You can also bring up the memory card manager by holding the start button when booting a game (Not all games have this option)
2. The black thing is the jumper pack, and can be replaced by an 'expansion pack'. Allways use an official one, since third party's can really mess things up. You need the expansion pack to play certain games (Donkey Kong 64, Majoras Mask, ...) or to enhance the game (Turok 2, Perfect Dark, ...)
3. I bought an Everdrive 64 V2 a couple of weeks ago, for around 115€. You should look at the website, it has a list with every website that sells them. Just be aware that in order to save your progress, you need to press the reset button after playing! Also, I never was able to get mine to save on the latest update, so I had to use the version before that.
Hope that helps you!