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Are you getting any beeps when it is starting?
Have you checked inside that everything is seated correctly, I know this is a bit hard with an all in one, but perhaps should be checked.
How old is the machine? Been any power surges or storms?
Have you tried starting it with your installation DVD or similar.
Have you tried booting it with a simple operating system on a CD, or USB Drive, linux mint for example?
Lot of things you can do to try and get it running so as to be able to isolate where the problem lies.
Someone may be able to talk you down once we have a few answers to the above.
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