my grandaughter tipped a glass of lemonade onto the Compaq Laptop keyboard. I tried to clean it up but the keyboard malfunctioned. I therefore fitted an external USB keyboard which worked well for several weeks. Now the m/c fails to boot I can hear the hard drive start up but the screen remains blank. I fitted an exteral monitor with the same results. To close down you have to hold down the 'start up' button until you hear the hard drive stop and the green LED goes out. Is the m/c donefore or can anyone offer a solution?