The screen looks like it has failed POST (power on self test). If it has the puter will issue beep codes to tell you what is wrong. I am linking the page for Dell Inspiron 530 beep codes.
When you turn on the puter, listen for the beeps. If it has failed post you should hear them and that should help you figure out what is going on.
I have a Dell Inspiron 530 that was working fine until this happened. It runs Vista.
Now I can do nothing but turn the machine off and on by the button. Any ideas on what has happened and what I can do to fix this will be greatly appreciated