Computer wont turn back on

[gelapappi]

ok heres the situation
for about a week now i go to get on my computer and its on standy when i go to get it off standby it wont go i have to turn it off manually and turn it back on

today it was on when i woke up i went to type my password for my SN for windows and it didnt recognise the keys so i turned it off and now it wont turn back on

what can i do ti fix this by tonight?

 

[Po`Girl]

Run through this lot HERE

Those are the first things to try.