Husband away. PC help, please.

Okay, please dont come for me if I'm being stupid- I dont usually have to problem solve these things myself. My computer monitor won't turn on despite being plugged into (I think) the right places. I've also tried my husband's monitor and cable and it still won't work.

I would ask my husband for help but he's not easily contactable at the moment and I just want to play games. Dory the dachshund would also like to know the answer, thank you.