My HP Altec Lansing is death

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please help me !
I have dual boot (vista/Ubuntu), during ubuntu start up, i did press the power button and now the laptop is completely death....
Any idea what can be the problem?

Thanks !

So is it able to turn on at all? Or does it not do anything when you press the button?

you mean "dead"

Just to add to pomis question

Please detach the power adaptor and battery
Also remove any external USB devices
Hold the ON switch in for 30 secs (dispersing all internal power)
Put the power adaptor in ONLY (confirming that the power source is Ok too)
Try turning on

If it works
Turn off, and put the battery back in
Turn on

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