I used my pc after being 3 weeks without using it, and when i first turned the power on, i saw that the keys (1,Q,A,Z, and caps lock) didn't work. As they are very close, i first thought someone had dropped some liquid or something over the keyboard, and so i used the hairdryer to dry it, but it didnt seem to work, after that, i used the vacuum cleaner in case there was something stuck in the keys, but it didnt work either, i cant even get in the computer because it has a password with the A letter 2 times in it. Can someone help me please?