how can i use an android tablet that I am locked out of I was given a cheap, basic, tablet a few months ago, third hand, via my sister who couldn't get on with it.  I tried it a bit then put it to one side to look at another time. When i came back to it (several months later) it asked for a password. I don't remember there being one, and nor does my sister so I'm stuck.  I know there normally ways to do factory resets in a state like this I've tried all of them, nothing works.  The tablet has no markings so I can't even look up that way.  I hate the idea of throwing it away, I'd like to use it as a monitor, or install a linux distro on it, but I've no idea how without the password. if anyone has any suggestion I'd be grateful
You should be able to access the recovery menu or similar and perform a factory reset by pressing and holding some button combination as the tablet first starts.  On most Nexus devices, for example, it's done by holding both volume buttons and the power button.