Hi I am new to this site. I was given a compaq presserio 900 series model 2140. The laptop was working fine for a while and all of a sudden it has blackscreen! When i turn the item on there is power but the screen which has compaq on it flicks on then back off again very quickly and then nothing just a black screen. I no nothing about pc's or laptops and don't know what to do!Would really appreciate any help!