I wouldnt think the hard drive is bad. Even without a hard drive you should have something on the screen.
What I would do, is look on the back of the computer. And there is a monitor port. Hook up an external monitor like for a desktop. To that port.
Then turn the computer off and on. If it picks up the monitor. Then you have an issue with the lcd screen.
If you dont see anything. Then it could be the motherboard or the graphics card has went out.
To back up my thoughts, read over the forum link below and see if it sounds similar.
http://h30434.www3.hp.com/t5/Hardware/Hp-Pavilion-dv900-wont-boot-up/td-p/140411
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