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Now that's a real call for remote diagnostics Liz.
Does it give any sequence of beeps when you turn it on? The number and pattern of these mean specific things. eg 3 quick then a gap then 2. You'd need to give us the exact model number to be sure to interpret them right.
It could be the screen. Does the screen show any light - even just the backlight - when you power it up? If the screen is working the BIOS should throw up some messages as it loads.
Does pressing "Caps Lock" or "Num Lock" light up those? If those work then the BIOS is loading.
Do you get any disk activity lights? If not it might be the CPU fan you are hearing.
If you are getting any of the status lights flashing you could try plugging an external screen into the video port to test if it is the screen that has died. If it was the video card you should get a beep code.
Any more clues you can provide might give you more things to try.
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