Help - my MacBook wont start?

The led is on but the machine wont start up?
I have tryed to hold the powerbutton down and violet close, but when I try to start up, the same problem appears :-(

I think you'll need to tell us a bit more: MacBook model, and what exactly happens.
For example, you're posting here under "MacBook Air" but refer to an LED... which the MBA doesn't have.
After holding down the Power button for a while (which shuts down the Mac no matter what), is that LED still on?
When you attempt to start it, can you hear the start-up gong?
Does the screen remain dark, or do you get to see at least a grey screen? If so, how far does it go before it stalls?

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